Date: Tue, 29 Apr 2008 00:44:18 -0700 From: Julian Elischer <julian@elischer.org> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: multiple routing tables review patch ready for simple testing. Message-ID: <4816D1D2.7010603@elischer.org>
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The patch can be found at http://www.freebsd.org/~julian/mrt.diff (or http://www.freebsd.org/~julian/mrt6.diff for RELENG_6) or source can be taken from perforce at: //depot/user/julian/routing/src a kernel needs to be created with the option ROUTETABLES=N e.g. +options ROUTETABLES=2 # max 16. 1 is back compatible. leaving this out will result in just a single routing table as per normal. the max is 16 but I have an artificial (even lower) at 8 but that may be gone by the time people try it :-) I ws informed early in this project that kernel routing tables should now be refered to as FIBs (forwarding Information base?). the new command "setfib" sets teh default fib for a process and all its decendents The ipfw command has been enhanced with fib and setfib commands netstat has been tweaked to cope with >1 table if used with setfib.. ipfw and setfib have man pages to look at. e.g. root@trafmon2:setfib -2 netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire 127.0.0.1 127.0.0.1 UH 0 0 lo0 172.28.0.0/24 link#3 UC 0 0 fxp0 172.28.0.1 00:c0:9f:41:cd:3c UHLW 1 0 fxp0 1189 172.28.10.0/24 link#2 UC 0 0 bge1 root@trafmon2:setfib -0 netstat -rn Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 172.28.0.1 UGS 0 20 fxp0 10.1.1.209 172.28.0.1 UGHS 0 0 fxp0 127.0.0.1 127.0.0.1 UH 0 20 lo0 172.28.0.0/24 link#3 UC 0 0 fxp0 172.28.0.1 00:c0:9f:41:cd:3c UHLW 3 0 fxp0 1188 172.28.10.0/24 link#2 UC 0 0 bge1 root@trafmon2: Currently it is IPV4 ONLY (other protocols will ignore the existance of other tables) there are two new sysctls. net.my_fibnum: 0 net.fibs: 3 Give it a test drive if you have any reason to want to do policy based routing or have multiple ISPs for different workloads etc. I'd like to get it out to a wider audience. all comments welcome. please read the file http://perforce.freebsd.org/fileViewer.cgi?FSPC=//depot/user/julian/routing/plan.txt&REV=5 for notes before using it. Julian
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