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10.12.2007 at 05:36PM PDT, ID: 22890844
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5.0

How to do source based routing in OS X Server

Asked by dalesit in Mac OS X, Network Routers, Unix Networking

Tags: , , , ,

I have an OS X Server which has 2 NICs with two ISP DSL accounts. There is one default route. I would like to have inbound traffic for the non-default interface to go via a separate router.

eg

en0: 192.168.1.10/24 router 192.168.1.1 - NATs to 1.2.3.4
en1: 192.168.2.10/24 router 192.168.2.1 - NATs to 4.3.2.1

Default route is 192.168.1.1

I would like to set up source based routing such that any inbound packet to 4.3.2.1 is replied to via the router 192.168.2.1

To do this, I have tried using the command

ipfw add  fwd 192.168.2.1 ip from 192.168.2.10 to not 192.168.2.10/24

which gives me an ipfw table of

00001 allow udp from any 626 to any dst-port 626
00010 divert 8668 ip from any to any via en1
00099 fwd 192.168.2.1 ip from 192.168.2.10 to not 192.168.2.0/24
01000 allow log ip from any to any via lo0
01010 deny ip from any to 127.0.0.0/8
01020 deny ip from 224.0.0.0/4 to any in
01030 deny tcp from any to 224.0.0.0/4 in
12300 allow log ip from any to any
65534 deny ip from any to any
65535 allow ip from any to any


When I try to ping to the external IP address from outside, I can see the packets reaching the server on the correct interface, but they do not seem to get any reply on either interface. If I remove the rule, then the reply packets can be seen going out through the default interface.

Cheers,

Joel


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About this solution

Zones: Mac OS X, Network Routers, Unix Networking
Tags: routing, x, based, os, source
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Solution Provided By: gheist
Participating Experts: 3
Solution Grade: C
 
 
 
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