I don't have a test box handy I can try it on, but does it still exhibit that behavior if you put a 'no ip directed-broadcast' in the interface config of the 10.0.0.5 interface?
By default it's on, so it takes anything for the network or broadcast Layer 3 addresses and spits them out as Layer 2 broadcasts, which the router may be seeing/processing. Ken Matlock Network Analyst Exempla Healthcare (303) 467-4671 matlo...@exempla.org -----Original Message----- From: cisco-nsp-boun...@puck.nether.net [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Ray Burkholder Sent: Friday, June 26, 2009 8:13 AM To: 'Geoffrey Pendery'; 'Ms Geekgirl' Cc: cisco-nsp@puck.nether.net Subject: Re: [c-nsp] Network Address Response > > No, I think he's asking why the router with address 10.0.0.5 responds > to pings that have a destination IP of 10.0.0.4. The echo request is > targeted at a network address, not at the router. Yes, that is the basis for my question. I suppose to clarify further, a /30 has four addresses: * network portion * link ip 1 * link ip 2 * broadcast Pings to the device originating on the ingress side but destined to the network portion of the egress side are responded to back out the ingress side with the link ip of the ingress side. It appears that the router listens to the 'network address' portion of a subnet. Is this good, bad, or ugly? Should-it/can-it be turned off? > > I've also observed this behavior (more than ICMP though - I have a > router responding to SNMP and being discovered by our configuration > management team, on the network address of one of its interfaces) and > would like to know more about why... > Ah, good, someone else has the same experience. -- Scanned for viruses and dangerous content at http://www.oneunified.net and is believed to be clean. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
