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07/12/2013

Useful tmsh Command

There is an awful lot of stuff you can do in the BigIP web console but one of the things you can't seem to do is get a list of all the client IP's connected to a particular VIP. In the past, this might be something you would execute a tcpdump on and then run through the trace in wireshark but this isn't really necessary if you're just looking for a quick snapshot of currently attached IP addresses to a particular virtual server.

Luckily, as long as you have tmsh access to your BigIP, just execute the following command to generate a list of client IPs attached to a partucular VIP:

tmsh show sys connection cs-server-addr <ip_address>

This will generate a tabular list including the following:

  • The Client IP Address and Port
  • The Virtual Server IP Address and Port
  • The SelfIP (SNAT) Address and Port
  • The IP Address and Port of the Member Server the request went to
  • The tmm process processing the connection

Pretty useful thing to use for those instances where you just want to see what is currenty hitting your VIP without having to run a trace!

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