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