Re: Re: mac to IP address?

I tried 'arp -a' on my router

? (203.7.224.11) at 00:04:27:FD:E1:A1 [ether] on eth1
? (128.8.10.90) at 00:04:27:FD:E1:A1 [ether] on eth1
? (66.39.54.27) at 00:04:27:FD:E1:A1 [ether] on eth1
? (192.168.1.3) at 00:10:5A:72:63:65 [ether] on eth0
? (210.49.1.23) at 00:04:27:FD:E1:A1 [ether] on eth1
? (192.149.252.21) at 00:04:27:FD:E1:A1 [ether] on eth1
? (202.154.92.35) at 00:04:27:FD:E1:A1 [ether] on eth1
? (198.246.0.28) at 00:04:27:FD:E1:A1 [ether] on eth1
? (204.74.112.1) at 00:04:27:FD:E1:A1 [ether] on eth1
? (137.92.140.80) at 00:04:27:FD:E1:A1 [ether] on eth1
? (63.192.96.3) at 00:04:27:FD:E1:A1 [ether] on eth1
? (172.17.1.249) at 00:04:27:FD:E1:A1 [ether] on eth1
? (192.36.148.17) at 00:04:27:FD:E1:A1 [ether] on eth1
? (192.168.1.20) at 00:0D:60:11:60:80 [ether] on eth0
? (192.175.48.6) at 00:04:27:FD:E1:A1 [ether] on eth1
? (202.12.28.131) at 00:04:27:FD:E1:A1 [ether] on eth1
? (64.29.18.163) at 00:04:27:FD:E1:A1 [ether] on eth1
? (172.17.1.80) at 00:04:27:FD:E1:A1 [ether] on eth1
? (202.154.106.97) at 00:04:27:FD:E1:A1 [ether] on eth1
? (128.250.36.2) at 00:04:27:FD:E1:A1 [ether] on eth1
? (128.250.36.3) at 00:04:27:FD:E1:A1 [ether] on eth1
? (128.250.37.2) at 00:04:27:FD:E1:A1 [ether] on eth1
? (202.154.95.173) at 00:04:27:FD:E1:A1 [ether] on eth1
? (203.21.37.18) at 00:04:27:FD:E1:A1 [ether] on eth1
? (129.127.28.4) at 00:04:27:FD:E1:A1 [ether] on eth1
? (211.115.194.21) at 00:04:27:FD:E1:A1 [ether] on eth1
[download]

see the pattern?

The arp won't help you getting IP's from networks after you have traversed a router (please correct me if I'm wrong). It only gives the MAC address of the router that can help get your packets to where they need to go.

Comment on Re: Re: mac to IP address? Download Code

Replies are listed 'Best First'.
Re: mac to IP address? by Anonymous Monk on Jan 23, 2004 at 02:54 UTC
Well, yes. That looks like a "problem". And consider one server within your network that has multiple IP addresses on one NIC ... RARP seems more usefull to you than ARP. I never really looked into that though, so I couldn't tell you exactly how it'd work (and I must say that I am too tired and lazy right now to read the RFC myself ;)	[reply]
Re: Re: Re: mac to IP address? by Anonymous Monk on Jan 24, 2004 at 17:43 UTC
`> I tried 'arp -a' on my router > ? (203.7.224.11) at 00:04:27:FD:E1:A1 [ether] on eth1 > ? (128.8.10.90) at 00:04:27:FD:E1:A1 [ether] on eth1 > ? (66.39.54.27) at 00:04:27:FD:E1:A1 [ether] on eth1` [download] You only get this if the router's been configured to use proxy arp - this isn't normally necessary or desirable	[reply] [d/l]


Syntactic Confectionery Delight
	PerlMonks