LTM Log Files

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I need to be able to see tcp traffic between client and F5 and between F5 and pool memebers. Anybody knows how I can setup and view that? Thanks

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if you have cli access, you can use tcpdump. You can specify a file for clientside/serverside separately or you can use the special interface 0.0 to capture from all links.

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by default, system log (e.g. /var/log/ltm) does not include application traffic. if you want to log application traffic, you can use irule.

e.g.

Log Http Tcp Udp To Syslogng

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by default, system log (e.g. /var/log/ltm) does not include application traffic. if you want to log application traffic, you can use irule.

e.g.

Log Http Tcp Udp To Syslogng

DevCentral - An F5 Technical Community

5

Hi Nitaas, Can’t i see tcp traffic between client and F5 and between F5 and pool memebers from F5 LTM cli??? If yes can you please shrae the commands to check it.

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Hi Nitaas, Can’t i see tcp traffic between client and F5 and between F5 and pool memebers from F5 LTM cli??? If yes can you please shrae the commands to check it.

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do yo mean packet? if yes, you can run tcpdump. tcpdump -nni 0.0 -s0 host x.x.x.x or host y.y.y.y x.x.x.x is client ip y.y.y.y is pool member ip

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do yo mean packet? if yes, you can run tcpdump. tcpdump -nni 0.0 -s0 host x.x.x.x or host y.y.y.y x.x.x.x is client ip y.y.y.y is pool member ip

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(more tcpdump info) - 404 Page not found | BIG-IP Documentation There is also the command “tmsh show sys connection” which will show you current connection details

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(more tcpdump info) - 404 Page not found | BIG-IP Documentation There is also the command “tmsh show sys connection” which will show you current connection details

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You can capture client side traffic and responding server side traffic using below command::

tcpdump -vvnni 0.0:nnnp -s0 host x.x.x.x and port yy

  • where x.x.x.x is Virtual IP and yy is virtual server port number

If you want to traffic for a specific client then::

tcpdump -vvnni 0.0:nnnp -s0 host x.x.x.x

  • where x.x.x.x is client IP

If you want write captured traffic to a file to review later in wire shark or some other tool use ‘w’ option and provide path to the file

tcpdump -vvnni 0.0:nnnp -s0 -w /var/tmp/capture.pcap host x.x.x.x