Was there a Microsoft update that caused the issue? 2) Is the above error message expected? Sometimes, Intrusion prevention blocks it if low priority attacks are also enabled for prevention. Check the access rules to ensure VPN and LAN. Please let me know. Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! Their office is connected via an always on VPN connection through sonicwalls located at each site. This is our local network and we are having problem with our phone registration because of this. Type 132 - Multicast Listener Done. Here is an example of what I'm seeing in the logs when this occurs 1 08/20/2014 08:06:25.400 Notice Network Access ICMP packet dropped due to policy 192.168.3.34, 1, X1 192.168.5.5, 8, W0 ICMP Echo, Code: 0, 2 08/20/2014 08:06:17.352 Notice Network Access Web access request dropped 192.168.3.34, 49216, X1 192.168.5.3, 80, W0 TCP HTTP, 3 08/20/2014 08:06:10.560 Notice Network Access TCP connection dropped 192.168.3.34, 49212, X1 192.168.5.3, 445, W0 TCP SMB, 4 08/20/2014 07:59:19.912 Notice Network Access UDP packet dropped 192.168.3.34, 137, X1 192.168.5.3, 137, W0 UDP NetBios NS UDP, 5 08/20/2014 07:59:14.752 Notice Network Access TCP connection dropped 192.168.3.34, 52380, X1 192.168.5.3, 445, W0 TCP SMB, I had a third person experience this issue this morning. I think my favorite is #5, blocking the mouse sensor - I also like the idea of adding a little picture or note, and it's short and sweet. A security ecosystem to harness the power of the cloud, Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions, Access to deal registration, MDF, sales and marketing tools, training and more, Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials, 10/14/2021 216 People found this article helpful 194,378 Views. (See attachement). This release includes significantuser interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The callmanager is connected to 2960G switch and the core switch is Cisco 4500 series. Nodes send neighbor solicitations to request the link-layer address of a target node while also providing their own link-layer address to the target. extended transactional funding, Browse our loan programs to find the one that works best for your transaction. I need to set up a private IPv6 tunnel from our main campus in Raleigh NC (fd00:1ac:1::/64) to our subsidiary campus in High Point NC (fd00:1ac:5::/64) over IPv4. Then, monitor the logs. All internal routing is done at core switch. The below resolution is for customers using SonicOS 6.2 and earlier firmware. . The sonicwall logs for that users IP lists ICMP dropped due to policy as well as a failed web access attempt for the same destination. It's not a route. It looks like something else is dropping our sccp packets. I would expect to have to create an IPv6 route to reach fd00:1ac:1::/64 via the Sonicwall's X1 (LAN) interface (fd00:1ac:5::ff/64 -> fd00:1ac:1::ff/64 via gateway fd00:1ac:5::fd) for PCs on the LAN. Either there is something I don't understand or it's a bug. This document is not restricted to specific software and hardware versions. Also, what model SonicWall and what version firmware? We have a Windows XP computer (don't ask) with network shares that, as of yesterday, are no longer reachable by other computers on the LAN. IPv6 relies much more on ICMP than IPv4. Unless DNS over TLS is enabled, this includes connections to port 53 to the group of DNS resolvers configured. All rights Reserved. The application reads this message and forwards it to both the NICs. Google says no. On this page several example nftable configurations can be found. I get the same result Really glad I stumbled on this old but still relevant post (still relevant on CUCM version 11.5 SU5). I give up. ICMP being blocked on the IPV4 level gave me issues creating the tunnel. If the SIP message does not include an i= line and if the original source IP address of the traffic (before NAT ) was 10.31.101.20 then the FortiGate unit would add the following i= line. The documentation set for this product strives to use bias-free language. Then it asks for a 'Prefix Length'. I'll try recreating the tunnel after hours. If you are working in a live network, ensure that you understand the potential impact of any command before using it. A node sends neighbor advertisements in response to neighbor solicitations and sends unsolicited neighbor advertisements in order to propagate new information quickly (which is unreliable). So I am confused and stuck in my work. I rebooted the sonicwall, but that didn't seem to resolve the issue. I'll spin up a pair of Windows Servers running Routing and Remote Access Services (RRAS) to create the tunnel. 04-25-2011 ASKER Meanwhile I am looking at installing and configuring a separate standalone server at both ends so I can build the dang tunnel. Access rule for ICMP has been created.Implicit Allow rule has been created. The TAP device is configured with both IPv4 and IPv6 address. config voip profile edit VoIP_Pro_1. You can unsubscribe at any time from the Preference Center. I can now ping IPv6 from fd00:1ac:5::/64 (High Point NC) to fd00:1ac:1::/64 (Raleigh) through an IPv4 GRE tunnel. So it should be possible. First, the source node assumes the path MTU is equal to its local MTU on the egress interface. First, you have to create the interface under 'IPv6' not 'IPv4'. Flashback: Back on December 9, 1906, Computer Pioneer Grace Hopper Born (Read more HERE.) My suggestion would be to (after hours) upgrade to most current firmware on both after you re-create the tunnels. why does blood flow to the kidneys decreased during exercise; hp omen 30l black screen tennis flashscore tennis flashscore I don't get the weird source address on the ping reply. Guess what, it worked! Hope this answers your query why changing to SIP worked for you. To configure Router Advertisement for an IPv6 interface, perform the following steps. Thanks Ken. The documentation says yes. (The choices offered are LAN or WAN, not VPN). If we try to ping this device from windows PC we cannot find this, normally IOS devices tend to send the ICMP at the faster rate. Due to a very wide list of supported hardware, VyOS cannot be optimized to any of it "out of the box". The Next Header field of the IPv6 Packet Header (or any Extension Header) contains the value 58 for an ICMPv6 message (versus 6 for TCP, 17 for UDP and 132 for SCTP). The below resolution is for customers using SonicOS 6.5 firmware. Allow essential connections for IPFire itself. Type 4 - Parameter Problem. But it is normal and is expected. I have this problem too Labels: Network Management 0 Helpful Share Reply All forum topics Previous Topic Are you running the IPS module on the Sonicwall? For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Your daily dose of tech news, in brief. config sip. Please mark this discussion answered if your are satisfy with the solution and do rate helpful post. I am wondering if something is fubar in the PBR object table in our SonicWall that has somehow screwed up the mapping of the Object ID with the IP version. The documentation says it can be done. For security policy that's okay for us for now. Again there seems to be zero documentation from Sonicwall on how to do this. Second, you have to provision it right: I had to assign the 6to4 GRE interface to the LAN zone. 11:47 PM There are multiple critical security concerns with ICMP. NOTE:By default, management traffic is not allowed between two different subnets. Even if I get this working, there is still the problem that the 6to4 GRE tunnel is not encrypting anything. As mentioned in that RFC, ICMPv6 includes protections, such as that 255 hop count, that ensure messages don't come from beyond the next device. This seems to be going the other way, lan 192.168.5.2 to 192.168.5.1 (firewall). SIP IP address conservation is enabled by default in a VoIP profile. All of the devices used in this document started with a cleared (default) configuration. https://quickview.cloudapps.cisco.com/quickview/bug/CSCth02826. Has anyone seen anything like this before? I have a feeling that this may not have anything to do with the Sonicwalls. To continue this discussion, please ask a new question. View with Adobe Reader on a variety of devices, Type-Length-Value (TLVs) Options for Neighbor Discovery ICMP Messages, 0 - No route to destination 1 - Communication with the destination is administratively prohibited, such as a firewall filter 2 - Not assigned 3 - Address unreachable 4 - Port unreachable, A Destination Unreachable message (Type 1) is generated in response to a packet that can not be delivered to its destination address for reasons other than congestion. This makes no sense to me, as I would expect to have to create an IPv6 route to reach fd00:1ac:1::/64 via the Sonicwall's X1 (LAN) interface (fd00:1ac:5::ff/64 -> fd00:1ac:1::ff/64 via gateway fd00:1ac:1::fd) for PCs on the LAN. - edited At the moment, there are still no solution, Customers Also Viewed These Support Documents. Something is messed up. Pinging fd00:1ac:1::ff didn't work either, but I expected that (no route). Unfortunately these sonicwalls aren't under my mysonicwall account at the moment, so I can't get the firmwares now. The Sonicwall promptly bitched at me that I was trying to assign the same IPv6 address to two different interfaces (which makes sense). Type 131 - Multicast Listener Report. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. ICMP is used to discover the path MTU. Getting this to work with the Sonicwall is like banging my head against the wall. Ping X3's interface IP from the PC behind X0. ICMP Packets are dropped due to Policy Drop when trying to ping the SonicWall interface, In the relevant access rule,Enable Management checkbox has not been selected. On one of the restricted boxes, assign it an IP of one that is working. If you look in the dashboard at the live log monitor, what does it report for the blocked traffic? The traffic is getting dropped at the sonicwall at the main office, so it is leaving their machines, so I doubt it is specific to their machines. The Source Link-Layer Address option contains the link-layer address of the sender of the packet. end. However, the Administration Guide does not give any actual instructions on how to provision the SonicWall to tunnel IPv6 inside a IPv4 VPN. But I see both are past 5.8.1.0 which was the minimum for the 2048-bit encryption deal that came out at the end of last year so they should be good. Or some sort of restrictions on the sever end regarding the IP addess of . On our NSA4600 (SonicOS 6.5.4) I went to VPN -> Add VPN Policy and set up the tunnel: So far so good. You can have low priority attacks under IPS in only detection mode and then test. As for the Sonicwall and firmware, both the remote site and this one are using Sonicwal TZ 210's. I pinged from HighPoint to fd00:1ac:5::fd and got a reply, which was wrongly dropped per policy as I explained above. It looks like something else is dropping our sccp packets. Make sure you have Global VPN client access as back door to remote site or you're hopping on a plane! I just want to get working; I can tighten it up later. 04:47 PM, Can anyone explain to me why this is happening, is it the cable problem or something wrong the switch, this only happen when we ping our Cisco Callmanager. For details of all codes, refer to. I can ping 10.1.x.x from 10.5.x.x through the IPv4 tunnel, all is wonderful. Copyright 2022 SonicWall. And in the Multicast Policy section, select the Enable the reception of all multicast addresses. Type 129 - Echo Reply. One is running firmwareSonicOS Enhanced 5.8.1.9-58o, the otherSonicOS Enhanced 5.8.1.5-46o. 0 - Hop limit exceeded in transit 1 - Fragment reassembly time exceeded, If a router receives a packet with a hop limit of zero, or a router decrements a packet's hop limit to zero, it, 0 - Erroneous header field encountered 1 - Unrecognized next header type encountered 2 - Unrecognized IPv6 option encountered, A Parameter Problem message is generated in response to an IPv6 packet with problem in its IPv6 header, or extension headers, such the node cannot process the packet and must discard it. specified and you attempt to start the monitor capture : % remote VSL port is not allowed as capture source The following message is displayed when a scheduled monitor capture start fails because a source is a remote VSL port channel: Packet capture session 1 failed to start. Can anybody confirm if the SonicWall allows IPv6 to be tunneled through an IPv4 site-to-site VPN? Some of our sccp IP Phone are unable to join the Call Manager. This document list all the possible types and codes for the Internet Control Message Protocol version 6 (ICMPv6) packet. Step 1 Enable multicast support on your SonicWALL security appliance. Could be an out-of-date hash that has not cleared. I can't find any online examples on how to do it. This topic has been locked by an administrator and is no longer open for commenting. Re: Sonicwall Global VPN client. I am not sure what version that is as I don't have any 210's under MySonicWall to check. Network card and driver optimization. The Target Link-Layer Address option contains the link-layer address of the target. Can't ping anything. We have options for most borrowers, and plenty of great properties in Florida, Georgia, Tennessee, North Carolina, South Carolina, Illinois, Texas, Michigan, and even New Jersey that are ready for your investment.. "/> Type 2 - Packet Too Big. Refer to RFC 2461 for more information on Neighbor Discovery for ICMPv6. NS/NA packet (ipv6 header + icmpv6 header+options) are filled and send by developer itself. I added an access rule for Zone LAN -> Zone LAN for any packet type. If that exceeds a hop's MTU, that hop returns an ICMPv6 Packet too big along with its own MTU. Thank you for your response. Routers send out router advertisement message periodically, or in response to a router solicitation. 2022 Cisco and/or its affiliates. In Wireshark, I have monitored that NS packet which I have filled is being send + Kernel sends NS packets of its own and receives NA packets. With ICMPv6 packets there is no Transport Layer header (UDP, TCP or SCTP). Gotcha - delete and re-add the tunnels. Pings will be successful and ICMP packets will not dropped by the SonicWall. I've looked through our sonicwall for any indicator as to why this is occurring, but nothing has shown itself. Swap the IPs and see if the problem moves. In our company we just configured a new host with an IP from a specific VLAN. Refer to RFC 2463 section 4 for more information on ICMPv6 informational message types and codes. Some of our sccp IP Phone are unable to join the Call Manager. That is normal icmp rate limiting, as you would have found by searching before posting. I expected to see fd00:1ac:1::fd not ff. Hosts send router solicitations messages in order to prompt routers to generate router advertisements messages quickly. Cisco reported a similar bug (https://quickview.cloudapps.cisco.com/quickview/bug/CSCth02826), so I'm wondering if this error message is related. 1) Does the SonicWall allow IPv6 to be tunneled through an IPv4 Tunnel? CORRECT ANSWER Ajishlal Community Legend Hi @Lucas, Neighbor Discovery ICMPv6 Messages Type-Length-Value (TLVs) Options for Neighbor Discovery ICMP Messages Related Information Introduction This document list all the possible types and codes for the Internet Control Message Protocol version 6 (ICMPv6) packet. Step 2 Enable multicast support on LAN interfaces. A standard application, say mozilla, opens a socket via the tap device and wants to connect to the active box. Hooray! I don't think we are running the IPS module. 1 In the Edit Interface window, click on the Router Advertisement tab. I've looked through our sonicwall for any indicator as to why this is occurring, but nothing has shown itself. There are no specific prerequisites for this document. Time Exceeded Message 3 0 Hop limit exceeded in transit 1 Fragment reassembly time exceeded If a router receives a packet with a hop limit of zero, or a router decrements a packet's hop limit to zero, it must discard the packet and send an ICMPv6 Time . Any further suggestions?. So, it is always a good idea to check some values and make fine-tuning, according to your network requirements. On our NSA4600 (SonicOS 6.5.4) I went to VPN -> Add VPN Policy and set up the tunnel: Then to test the link I went to Network -> Routing to set up a Policy Based Route (PBR) to connect our IPv4 network in High Point (10.5.0.0/16) to our IPv4 network in Raleigh (10.1.0.0/16) through the VPN tunnel: It works great. At the moment, there are still no solution I will need to look into others possibilities.. Did this ever get answered for you? For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware. It is used in the neighbor solicitation, router solicitation, and router advertisement packets. Only 2 people in location? At first I thought this was part of the route info (presumably broadcast to the LAN by IPv6 Router Advertisements), but no. Then I experienced speed and connection issues on some sites that used IPv6, but I traced that down to the firmware my router was using. According to Cisco TAC after reviewing our packet sniffing result, it looks like something is dropping the packet since there is a lot of tcp retransmission on the phone side. Two people so far. (16,366 Views) I have heard where a VPN client would not connect if the server is running on the same subnet. Next I had to assign a the local 'Tunnel Interface IPv6 Address'. PfSense running on Qotom mini PC i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports. The access rule is in place for wan (anywhere) to 192.168.5.2 (allow). The source of fd00:1ac:1::ff was odd. I've seen signature updates break simple things like ICMP on tunnels that were already established. So close. I've been able to work around it by setting a different IP statically for the user. For more information on document conventions, see the Cisco Technical Tips Conventions. Link=http://www.cisco.com/c/en/us/td/docs/security/asa/asa82/configuration/guide/config/conns_tcpstatebypass.html. I monitored the packets from the remote IP and was able to find the ICMP packets were being dropped due to the following: ICMP Packet Header ICMP Type = 8 (ECHO_REQUEST), ICMP Code = 0, ICMP Checksum = 9757 Value: [1] DROPPED, Drop Code: 727 (Packet dropped - Policy drop), Module Id: 27 (policy), ( Ref.Id: _2721_qpmjdzDifdl) 2:1) Surely someone has done this before? Yet two people so far have had issues reaching anything on the subnet at my office. this should not be happening. First drop into configuration mode with the command "configure". It seems to affect one user at a time, and changing the IP address seems to work around the issue. You can check if at the firewall you have configured SCCP inspection as this configuration normally makes SCCP to lose icmp messages finishing on unregistered phones or issues at the time of registering them. 2 The MTU option is used in router advertisement messages to insure that all nodes on a link use the same MTU value in those cases where the link MTU is not well known. It turns out that you can create a 6to4 interface for a an IPv4 GRE tunnel for IPv6 packets. packet is larger than the Maximum Transmission Unit (MTU) of the outgoing link. Vyatta has so many tools built in to make troubleshooting much easier. Thanks! Why is this so hard? The main problem is having a control-level feedback (ttl-exceeded) that is not only sent by the destination, but by intermediate hops too.It can be used for device fingerprinting based on characteristics (initial TTL, IP flags and more importantly IP ID) of the ICMP message. It is used in neighbor advertisement and redirect packets. Next-generation firewall for SMB, Enterprise, and Government, Comprehensive security for your network security solution, Modern Security Management for todays security landscape, Advanced Threat Protection for modern threat landscape, High-speed network switching for business connectivity, Protect against todays advanced email threats, Next-generation firewall capabilities in the cloud, Stop advanced threats and rollback the damage caused by malware, Control access to unwanted and unsecure web content, SSLVPN Timeout not working - NetBios keeps session open, Configuring a Virtual Access Point (VAP) Profile for Internal Wireless Corporate Users, How to hide SSID of Access Points Managed by firewall, Ping will now be permitted.Also uncheck the option-. Seen strange things on a few VPN tunnels when managing global 25 site SonicWall network. I am so close now, but the dang Sonicwall is dropping all incoming IPv6 packets from the 6to4 tunnel no matter what access rules I add. You can verify if currently on your firewall is in use TCP state bypass, this might sometimes is related to unregistered phones or issues when registering devices to your CUCM. IE: server on 192.168.1.x and VPN client 192.168.1.x subnet. I'd need to see the log information from the text file you mentioned. ICMP Packets are dropped due to Policy Drop when trying to ping the SonicWall interface Cause In the relevant access rule, Enable Management checkbox has not been selected NOTE: By default, management traffic is not allowed between two different subnets. I have created a socket socket (AF_INET6, SOCK_RAW, IPPROTO_IPV6). Will likely try tonight. This issue may continue if I don't resolve it. Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use. This message is generated in response to an echo request message. set nat-trace disable end. I pinged from from High Point to fd00:1ac:1::fd and got a reply. Nothing else ch Z showed me this article today and I thought it was good. picrew character maker girl. I then added an IPv6 Policy Based Route through the IPv4 tunnel to route fd00:1ac:5::/64 to fd00:1ac:1::/64 but I got an error message: I went to Google to search for "IPv6 PBR Object ID" and "SonicWall IP version mismatch" and got basically no useful hits. The third and fourth exmaple show how, using nftables, rules can be simplified by combining IPv4 and IPv6 in the generic IP table 'inet'. Use these resources to familiarize yourself with the community: It is the firewall policy inside the CUCM doing this. Why is the ping is like dropping every 6th packet. Anyway, at this point I was ready to run a ping test. There are a total of 6 ICMPv6 messages defined in RFC 4443 (compared to 11 for ICMPv4). Interestingly, the packet statistics for the rule showed an incrementing Tx packet count for each ping attempt, but zero Rx packets coming back. I knew the UDP packet drops were related to DNS. Cisco CUCM and other VOIP products(CUC) use a rate limit on their firewall and we can safely ignore this. Go with the last stable release. ip6tables -A INPUT -p icmpv6 --icmpv6-type 134 -j REJECT The default setting of the hop limit field is usually set to 255 and gets decremented by one every time a router forwards a packet. The Redirected Header option is used in redirect messages and contains all or part of the packet that is being redirected. Review the logs of your switch and see if you have any errors on any of the ports particularly the port the sonicwall is connected to. Run them both the same if at all possible. This week I started getting complaints from some users in our other office about losing access to our NAS. Work arounds was to migrate them to SIP. Bonus Flashback: Back on December 9, 2006, the first-ever Swedish astronaut launched to We have some documents stored on our SharePoint site and we have 1 user that when she clicks on an Excel file, it automatically downloads to her Downloads folder. Welcome to the Snap! The return pings are getting dropped by policy despite a wildcard access rule allowing it. A Packet Too Big message is sent in response to a packet that it cannot forward because the packet is larger than the Maximum Transmission Unit (MTU) of the outgoing link. Having two different firmwares on the same models can cause weird things too. our CUC and CUCCx that share the same host in the ESX5.0 had the same OS and share the same behaivor. All rights reserved. Question: What the heck does 'Prefix Length' mean in this context? Tshark is built into Vyatta, which is just modified Debian. It is barely documented, and it is very non-obvious how to provision it. The weird thing is that the dropped Ping Reply packet had source=fd00:1ac:1:ff (Raleigh X1) dest=fd00:1ac:5::fd (High Point GRE). Try to disable content filtering and if it solves the issue. The fifth example shows how nftables can be combined with bash scripting. The packets still got dropped. A VPN can also be used to interconnect two similar networks over a dissimilar middle network: for example, two IPv6 networks connecting over an IPv4 network. Then to test the link I went to Network -> Routing to set up a Policy Based Route (PBR) to connect our IPv4 network in High Point (10.5.0.0/16) to our IPv4 network in Raleigh (10.1.0.0/16) through the VPN tunnel: It works great. I received back an ICMPv6 Type 129 (Echo Reply) packet .. which the SonicWall promptly dropped, citing a policy violation in the log ('No rule LAN -> LAN for this packet type'). Learn more about how Cisco is using Inclusive Language. The other weird thing was the source address on the ICMPv6 Ping Reply (Type 129). To sign in, use your existing MySonicWall account. A source port is a remote VSL. Prerequisites Requirements There are no specific prerequisites for this document. With over 10 pre-installed distros to choose from, the worry-free installation life is here! This field is for validation purposes and should be left unchanged. There is no SonicWall documentation on this anywhere I can find. Computers can ping it but cannot connect to it. My boss is asking me if I will recommend SonicWall for future firewall upgrades and right now I am not very sanguine about it. If you could send that over it would be greatly appreciated. Page 6 of the SonicOS 7and SonicOSX 7 IPSec VPN Administration Guide says. Type 128 - Echo Request. For more details refer to, Used to check and troubleshoot connectivity using the IPv6. Find answers to your questions by entering keywords or phrases in the Search bar above. Here is the list of some things, which can require your attention for optimization: 1. Report errors in the forwarding or delivery of IPv6 packets. I was also worried that it might start sending out bogus RA address assignments, wrongly handing out fd00:1ac:1::/64 SLAAC assignments to our PCs in High Point and screwing them up, but that didn't happen. Once I downgraded to an older firmware, those issues resolved themselves. They can definitely access each other, as other users at this site can still reach the NAS and other devices at the main site. Routers send redirect packets to inform a host of a better first-hop node on the path to a destination. This seems intuitively backwards as the interface is assigned IPv4 addresses at both ends, but whatever. New here? View solution in original post. If the packets appear malformed, then the sonicwall will drop them. For instance, in this knowledge base article, X0 LAN subnets will not able to ping/manage X3 DMZ Gateway and vice versa. Usually we would just delete the tunnel and start over. If it does check your firewall for block rules based on IP. I've been able to work around it by setting a different IP statically for the user. According to Cisco TAC after reviewing our packet sniffing result, it looks like something is dropping the packet since there is a lot of tcp retransmission on the phone side. The SonicWall at Highpoint has X1 (LAN) fd00:1ac:1::ff, with its counterpart in Raleigh having fd00:1ac:5::ff. The latter is accomplished by setting the ICMP target address equal to the ICMP destination address. Message 2 of 9. The reasons for the non-delivery of a packet is described by code field value. The ICMP message contains enough details from the original packet for the source node to match the connection. Dropping 6th ICMP packets Go to solution Razmir Masri Abdul Razak Beginner Options 04-25-2011 11:47 PM - edited 03-06-2019 04:47 PM Hi All, Can anyone explain to me why this is happening, is it the cable problem or something wrong the switch, this only happen when we ping our Cisco Callmanager. Type 1 - Destination Unreachable. Either there is something I don't understand, or there is a bug. Assuming the router works correctly, this next rule will only allow echo request and echo response messages to and from nodes on the local Ethernet segment. Why is the ping is like dropping every 6th packet. The Prefix Information option provide hosts with on-link prefixes and prefixes for address autoconfiguration. Hosts can be redirected to a better first-hop router but can also be informed by a redirect that the destination is in fact a neighbor. 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