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- ARP-catch
- 1997 Thomas H. Ptacek
- This is a 4.4BSD program that implements, in userland, third-party
- proxy ARP. In a nutshell, this lets you proxy-ARP an arbitrary IP
- address to an arbitrary MAC address, from any machine on the network.
- This is useful if your router doesn't do proxy ARP, or does it only
- in an all-or-none fashion.
- This code will not work outside of 4.4BSD (it relies on BPF). Furthermore,
- it won't run on most 4.4BSD operating systems, because a problem with the
- standard BPF implementation (try spoofing your source ethernet frame
- address on NetBSD). I've made available an LKM that "fixes" the problem on
- FreeBSD 3.0; you can find it at http://www.enteract.com/~tqbf.
- There's not much to document here. The program is a daemon, and reads
- a config file. The config file consists of "router" and "proxy" lines; a
- "router" line gives a symbolic name for a MAC address, ie:
- router gateway de:ad:be:ef:ca:fe
- ... and a "proxy" line maps an IP address to a router name or a MAC
- address, ie:
- proxy 10.100.200.1 gateway
- proxy 10.100.200.2 ab:ad:ca:fe:00:11
- This is fairly esoteric stuff; read the code if you need to know more.
- If you have problems, questions, comments, bitches, etc, feel free to mail
- me at <tqbf@secnet.com>
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