For those who's a little confused in my email below sent before, here is a similar post that describes what I mean (hopefully):
http://www.monkey.org/openbsd/archive/misc/9903/msg00109.html Thanks in advance! -hc On Mon, Dec 08, 2003 at 01:53:20PM -0500, [EMAIL PROTECTED] wrote: > Hi, > > Is there anyway to source the ICMP reply (i.e. ttl-exceeded for traceroute) on > a FreeBSD box acting as router to an IP address different than the one bound on > the interface, in which the destination route is pointed at? > > For example: > > Let say we have an asymmetric routing situation here... > > A client host is 1.2.3.4, and the FreeBSD box has fxp0 with 2.2.2.2, and fxp1 > with 3.3.3.3, > > Client runs traceroute to a host routed by the FreeBSD router. The packet > arrives on FreeBSD router's FXP0 interface. But the route for 1.2.3.4 (client) > on router's routing table points out to FXP1. > > Here in this case, the icmp ttl-exceeded message from the FreeBSD router will > be sourced from 3.3.3.3, which is the main ip address of FXP1 (hence, the > interface where route for 1.2.3.4(the client) is bound to) > > I'm looking to make it so that if a packet arrives on FXP0, I'd like the FreeBSD > box to respond icmp ttl-exceeded OUT via FXP0, with source address of FXP0's IP. > So in other words, I'd like to have icmp replies go out via the interface the > packet originally hit the box, instead of via the interface that holds the > route for the source of the packet. This type of implementation is done on > some vendors (including Cisco) and sometimes can be helpful troubleshooting > asym. routing situations.. > > Any suggestions would be appreciated. Thanks > ` > -- > James Jun (formerly Haesu) > Network Operations > TowardEX Technologies, Inc. > Consulting, colocation, web hosting, network design and implementation > http://www.towardex.com | [EMAIL PROTECTED] > Cell: (978)394-2867 | Office: (978)263-3399 Ext. 170 > Fax: (978)263-0033 | AIM: GigabitEthernet0 > NOC: http://www.twdx.net | POC: HAESU-ARIN, HDJ1-6BONE > _______________________________________________ > [EMAIL PROTECTED] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "[EMAIL PROTECTED]" -- James Jun (formerly Haesu) Network Operations TowardEX Technologies, Inc. Consulting, colocation, web hosting, network design and implementation http://www.towardex.com | [EMAIL PROTECTED] Cell: (978)394-2867 | Office: (978)263-3399 Ext. 170 Fax: (978)263-0033 | AIM: GigabitEthernet0 NOC: http://www.twdx.net | POC: HAESU-ARIN, HDJ1-6BONE _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
