how can I make a tcpdump on the BIG-IP on the interfaces?

same as any tcpdump implementation.

 

 

Examples:

 

 

tcpdump -ni 1.1 tcp port 80 -w/var/tmp/http.cap

 

 

tcpdump -ni public_vlan tcp port 21 -w/var/tmp/ftp.cap

 

 

tcpdump -ni 0.0 udp 1645 -w/var/tmp/all_interfaces_radius.cap

 

 

For more syntax information, google tcpdump. For future reference, this forum is for iRules questions, there isn't yet a Configuration & troubleshooting forum.... hopefully soon?