{"id":698,"date":"2012-08-01T00:00:00","date_gmt":"2012-08-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2012\/08\/01\/f5-ltm-icmp-packet-loss\/"},"modified":"2021-07-24T18:13:03","modified_gmt":"2021-07-24T18:13:03","slug":"f5-ltm-icmp-packet-loss","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-icmp-packet-loss.html","title":{"rendered":"F5 LTM &#8211; ICMP packet loss when using packet filters"},"content":{"rendered":"<h3><strong>Issue<\/strong><\/h3>\n<p>You may observe that ICMP response (return) traffic is randomly dropped by the F5. This behaviour occurs when using tagged VLANs and packet-filters on the F5.<br \/>Below shows the issue in further detail. An ICMP Ping is initiated from the F5 and a packet capture is run.&nbsp; We can see from the Ping that the Reply for seq=186 is not received.<\/p>\n<p class=\"codemulti\">[root@f5-ltm:Active] ~ # ping 192.168.1.100<br \/>PING 192.168.1.100 (192.168.1.100) 56(84) bytes of data.<br \/>! output omitted !<br \/>64 bytes from 192.168.1.100: icmp_seq=185 ttl=255 time=1.10 ms<br \/>64 bytes from 192.168.1.100: icmp_seq=187 ttl=255 time=1.37 ms<br \/>64 bytes from 192.168.1.100: icmp_seq=188 ttl=255 time=0.992 ms<\/p>\n<p>However within the packet capture we can see that seq=186 is seen by the F5 but incorrectly processed as VLAN 0 and in turn dropped.<\/p>\n<p class=\"codemulti\">[root@f5-ltm:Active] ~ # tcpdump -s 0 -ni TRUNK-SEGMENT-VLAN100:nnn host 192.168.1.100 and icmp<br \/>tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on TRUNK-SEGMENT-VLAN100:nnn, link-type EN10MB (Ethernet), capture size 65535 bytes<br \/>15:01:12.612487 IP 192.168.1.100 &gt; 172.16.1.100: ICMP echo reply, id 23101, seq 186, length 64 in slot1\/<span style=\"background-color: #ffff00;\"><strong>tmm0<\/strong><\/span> lis= flowtype=0 flowid=0 peerid=0 conflags=0 inslot=0 inport=256 haunit=0 peerremote=00000000:00000000:00000000:00000000 peerlocal=00000000:00000000:00000000:00000000 remoteport=0 localport=0 proto=0 <strong><span style=\"background-color: #ffff00;\">vlan=0<\/span><\/strong><br \/>15:01:12.612113 IP 172.16.1.100 &gt; 192.168.1.100: ICMP echo request, id 23101, seq 186, length 64 out slot1\/tmm1 lis= flowtype=130 flowid=BBEA1C0 peerid=B95B800 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:0AA0FDEA peerlocal=00000000:00000000:0000FFFF:0BB0C0E2 remoteport=23101 localport=8 proto=0 vlan=100<br \/>15:01:13.611519 IP 172.16.1.100 &gt; 192.168.1.100: ICMP echo request, id 23101, seq 187, length 64 out slot1\/tmm1 lis= flowtype=130 flowid=BBEA1C0 peerid=B95B800 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:0AA0FDEA peerlocal=00000000:00000000:0000FFFF:0BB0C0E2 remoteport=23101 localport=8 proto=0 vlan=100<br \/>15:01:13.611872 IP 192.168.1.100 &gt; 172.16.1.100: ICMP echo reply, id 23101, seq 187, length 64 in slot1\/tmm1 lis= flowtype=130 flowid=BBEA1C0 peerid=B95B800 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:0AA0FDEA peerlocal=00000000:00000000:0000FFFF:0BB0C0E2 remoteport=23101 localport=8 proto=0 vlan=100<br \/>15:01:14.612884 IP 172.16.1.100 &gt; 192.168.1.100: ICMP echo request, id 23101, seq 188, length 64 out slot1\/tmm1 lis= flowtype=130 flowid=BBEA1C0 peerid=B95B800 conflags=E26 inslot=0 inport=0 haunit=0 peerremote=00000000:00000000:0000FFFF:0AA0FDEA peerlocal=00000000:00000000:0000FFFF:0BB0C0E2 remoteport=23101 localport=8 proto=0 vlan=100<br \/>15:01:14.613182 IP 192.168.1.100 &gt; 172.16.1.100: ICMP echo reply, id 23101, seq 188, length 64 in slot1\/tmm1 lis= flowtype=130 flowid=BBEA1C0 peerid=B95B800 conflags=E26 inslot=0 inport=512 haunit=0 peerremote=00000000:00000000:0000FFFF:0AA0FDEA peerlocal=00000000:00000000:0000FFFF:0BB0C0E2 remoteport=23101 localport=8 proto=0 vlan=100<\/p>\n<p>This can cause a number of issues such as ICMP Node monitor failure and\/or packet-loss to transit traffic.<\/p>\n<p><em>Note<\/em> : This issue only affects ICMP traffic.<\/p>\n<h3><strong>Background<\/strong><\/h3>\n<p>This issue was originally tracked (via CR120747) and resolved (via a hotfix) in version 10.1. However at present there is no documented hotfix for this bug within 10.2.<\/p>\n<h3><strong>Workaround<\/strong><\/h3>\n<p>As it stands there are 2 work-arounds<\/p>\n<ol style=\"list-style-type: lower-alpha;\">\n<li>exclude the VLAN from the packet filter.<\/li>\n<li>add an explicit allow for the ICMP reply (or return traffic). Further details can be found in the link below.<\/li>\n<\/ol>\n<h3><strong>Reference<\/strong><\/h3>\n<p><a href=\"http:\/\/support.f5.com\/kb\/en-us\/solutions\/public\/10000\/100\/sol10179.html\">http:\/\/support.f5.com\/kb\/en-us\/solutions\/public\/10000\/100\/sol10179.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Issue You may observe that ICMP response (return) traffic is randomly dropped by the F5. This behaviour occurs when using tagged VLANs and packet-filters on the F5.Below shows the issue in further detail. An ICMP Ping is initiated from the F5 and a packet capture is run.&nbsp; We can see from the Ping that the &#8230; <a title=\"F5 LTM &#8211; ICMP packet loss when using packet filters\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-icmp-packet-loss.html\" aria-label=\"Read more about F5 LTM &#8211; ICMP packet loss when using packet filters\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>F5 LTM - ICMP packet loss when using packet filters - Fir3net<\/title>\n<meta name=\"description\" content=\"Issue You may observe that ICMP response (return) traffic is randomly dropped by the F5. 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