Subject: Re: question about ipf "fastroute"
To: None <firstname.lastname@example.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 02/13/2003 16:39:34
> I want to do source address based routing for some particular IPs.
I have a pseudo-interface driver that does exactly this:
[Truly-Delicious - root] 75> netstat -rn -f inet | egrep srt0
default 10.0.0.1 UGS 3 468844 1500 srt0
10.0.0.1 184.108.40.206 UH 1 0 1500 srt0
My default route points out an srt interface. The interface is
[Truly-Delicious - root] 76> ifconfig srt0
srt0: flags=11<UP,POINTOPOINT> mtu 1500
inet 220.127.116.11 --> 10.0.0.1 netmask 0xffffffff
[Truly-Delicious - root] 77> srtconfig srt0
0: 18.104.22.168 /32 rl0 22.214.171.124
1: 126.96.36.199 /32 ppp0 188.8.131.52
The srtconfig output indicates that packets whose source address is
184.108.40.206 are sent out rl0 with next-hop address 220.127.116.11; those
whose source address is 18.104.22.168 go out ppp0 with next-hop address
22.214.171.124. (This is actually outdated; the next-hop address for ppp0
should be different. The only reason this works is that ppp0 ignores
the next-hop address.) Packets with other source addresses are
silently dropped; that machine should not be sending packets with any
other source addresses down its default route.
> But, how do I do this with an ethernet?
Install sys/dev/pseudo/if_srt* from my patch tree? :)
This assumes it's IPv4. I haven't yet taught it about IPv6.
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