At 2003-08-15 14:15:00+0000, Lars Eggert writes: > Nick Barnes wrote: > > Thanks for the reference. I had a look at arping. It works by sending > > a broadcast ping to the specified MAC address (not to the broadcast > > MAC). I note that FreeBSD machines do respond to such pings (unlike > > regular broadcast pings), but some machines do not (e.g. WinXPPro, > > NT4). > > it also supports setting the source IP and MAC address to one specified > on the command line. This usually works for these other boxes, if you > use a valid one for the net you're on.
The source IP and MAC are not a problem (they are both set correctly already). The problem is that the ping packets don't have an appropriate destination IP address. This can be set with the -T option for arping, but if I set it to anything other than the target machine's actual address (which I'm trying to use arping to find!) then WinXPPro, for instance, will not respond: # XP Pro 193.112.141.247 00:07:e9:92:c0:76 # default arping, destination address 255.255.255.255: # NO RESPONSE # ./arping -c 1 -q -i rl0 00:07:e9:92:c0:76 15:43:02.245550 0:50:fc:1:f4:e 0:7:e9:92:c0:76 0800 60: 193.112.141.249 > 255.255.255.255: icmp: echo request # # Use -T to set destination address to local broadcast 193.112.141.255: # NO RESPONSE # ./arping -T 193.112.141.255 -c 1 -q -i rl0 00:07:e9:92:c0:76 15:43:14.577626 0:50:fc:1:f4:e 0:7:e9:92:c0:76 0800 60: 193.112.141.249 > 193.112.141.255: icmp: echo request # # Use -T to set destination address to another local address 193.112.141.248: # NO RESPONSE # ./arping -T 193.112.141.248 -c 1 -q -i rl0 00:07:e9:92:c0:76 15:44:45.764904 0:50:fc:1:f4:e 0:7:e9:92:c0:76 0800 60: 193.112.141.249 > 193.112.141.248: icmp: echo request # # Use -T to set destination address to the actual target address # (which we are trying to use arping to find): # RESPONSE (i.e. the machine is working). # ./arping -T 193.112.141.247 -c 1 -q -i rl0 00:07:e9:92:c0:76 15:48:47.687538 0:50:fc:1:f4:e 0:7:e9:92:c0:76 0800 60: 193.112.141.249 > 193.112.141.247: icmp: echo request 15:48:47.687680 0:7:e9:92:c0:76 ff:ff:ff:ff:ff:ff 0806 60: arp who-has 193.112.141.249 tell 193.112.141.247 15:48:47.687710 0:50:fc:1:f4:e 0:7:e9:92:c0:76 0806 60: arp reply 193.112.141.249 is-at 0:50:fc:1:f4:e 15:48:47.687775 0:7:e9:92:c0:76 0:50:fc:1:f4:e 0800 60: 193.112.141.247 > 193.112.141.249: icmp: echo reply # Nick B _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
