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Asked by fredzo1966 in Cisco PIX Firewall, Networking Hardware Firewalls, Network Operations
I am moving public, routable IP addresses from Linux boxes to a Cisco ASA 5505 firewall as part of moving client web sites to new servers behind the firewall and on a local network with non-routable addresses (i.e. WAN-to-LAN NAT on the firewall). I'm sure that I'm running into a problem with our network switch on the public side, because when I drop the interface on the Linux box and add the address to the WAN side of the firewall, I get no response for up to hours at a time. It eventually clears up, but I have a whole Class C of addresses to change, and I need faster cut-over time. I know that if this were all on the same subnet as the new server, I could broadcast the ARP information using "arping" to get the switch to clear, but the problem is that the new server is behind the firewall on a local address.
What I need is for the firewall itself to broadcast the ARP information on the WAN side, and not just for its base IP address, but specifically for the WAN IP address I've just added to it. Is this possible? I can't find any documentation other than viewing and clearing or setting the timeout of the ARP cache on the firewall itself. If I can't get the firewall to broadcast newer MAC information to the switch, does anyone know of a creative alternative to get the switch to pick up the address faster? (Obviously, I don't have administrative control of the switch.)
20091111-EE-VQP-92 - Hierarchy / EE_QW_3_20080625
