BIG-IP : redirect loop : debugging techniques

From the command line, type:

ifconfig    

This will show you all of the interfaces on the system. If for example you've named the internal VLAN "internal", then you can actually use this VLAN name in tcpdump.

tcpdump -lnni internal -Xs0    

If you wanted to show traffic from all interfaces, you can use 0.0

tcpdump -lnni 0.0 -Xs0

As for additional filters, assuming you have other traffic on the internal VLAN that you want to not see, you can add filters to the tcpdump to limit what you capture. So for example, if the web server is listening on port 80 and its IP address is 10.10.10.1, a tcpdump with additional filtering might look like this:

tcpdump -lnni internal -Xs0 host 10.10.10.1 and port 80    

The -Xs0 option will dump the layer 7 payload to the screen, so you'll be able to see a 302 response if it is in fact coming from the web server.