Interface IP Address Usage Mystery???



  • I’ve got my 5GT configured in extended mode with the trust interface on Ethernet1. The IP address of this interface is 10.1.1.1/24.

    The DMZ interface is on Ethernet2 and has an IP of 10.1.2.1/24.

    The box responds to pings and telnet to both 10.1.1.1 and 10.1.1.2!

    When I send an arp request from a box at 10.1.1.8 for 10.1.1.2, I get a reply with the Ethernet1 interface’s MAC address.

    Why does the 5GT take two IPs on this interface? It doesn’t seem to be just doing proxy arp for the 10.1.1.2 address because I can telnet to that address and log into the 5GT’s CLI interface.



  • Check your configuration and see if you have a manage-ip configured for ethernet1. I would wager that you have ethernet1 IP 10.1.1.1/24 and manage-ip of 10.1.1.2.


 

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