nanog mailing list archives
Re: Junos Asymmetric Routing
From: Larry Sheldon <LarrySheldon () cox net>
Date: Thu, 27 May 2010 20:49:06 -0500
On 5/27/2010 19:38, Ken Gilmour wrote:
Wow, very fast responses, Thanks Larry Sheldon and Ricardo Tavares! On 27 May 2010 18:07, Ricardo Tavares <curupas () gmail com> wrote:Not sure if I correctly undestand you but default route its the route that the packet must follow if it do not have a specific route for the destination, so, if the next-hop for the source IP (3.3.3.3) is not in the route table then the packet will follow the default route (ISP1).Yes I believe that would be the default if the session was initiated on the inside, but if it comes from outside on a particular interface which is not the default route, why would the router then send the packet out another interface? Should the device not route session-based traffic according to where it originated?
I'm close to the edge of what I know (or remember--i've been inactive for a while) but when a packet arrives on an interface, the routing engine has to decide where to poke it bqased on what is in the packet--there is no information as to where it came from, or to what it is a response. If it isn't in the IP header, it isn't available for routing decisions. ("Policy routing" can provide additional data, as can source routing. But one requires a human being to provide the rule, and the other requires somebody or something else outside the router to calculate the route. I don't think anybody much allows source routing anymore.) -- Somebody should have said: A democracy is two wolves and a lamb voting on what to have for dinner. Freedom under a constitutional republic is a well armed lamb contesting the vote. Requiescas in pace o email Ex turpi causa non oritur actio Eppure si rinfresca ICBM Targeting Information: http://tinyurl.com/4sqczs http://tinyurl.com/7tp8ml
Current thread:
- Junos Asymmetric Routing Ken Gilmour (May 27)
- Re: Junos Asymmetric Routing Larry Sheldon (May 27)
- Re: Junos Asymmetric Routing Ricardo Tavares (May 27)
- Re: Junos Asymmetric Routing Ricardo Tavares (May 27)
- Re: Junos Asymmetric Routing Ken Gilmour (May 27)
- Re: Junos Asymmetric Routing joel jaeggli (May 27)
- Re: Junos Asymmetric Routing Ricardo Tavares (May 27)
- Re: Junos Asymmetric Routing Larry Sheldon (May 27)
- Re: Junos Asymmetric Routing Mark Hermsdorfer (May 28)
- Re: Junos Asymmetric Routing Ken Gilmour (May 28)
- Re: Junos Asymmetric Routing Adrian Chadd (May 28)
- Re: Junos Asymmetric Routing Larry Sheldon (May 28)
- Re: Junos Asymmetric Routing Ken Gilmour (May 27)
- Re: Junos Asymmetric Routing Jack Bates (May 28)
- Re: Junos Asymmetric Routing Joe Blanchard (May 27)
- Re: Junos Asymmetric Routing Ken Gilmour (May 28)
- Re: Junos Asymmetric Routing Ken Gilmour (May 28)
- Re: Junos Asymmetric Routing Jian Gu (May 28)