Multiple routes to same destination

[Webster, Andrew]

> 
> Qing Li wrote:
> 
> I use mpd to greate one VPN between the sites, using Multilink PPP, so
> that
> data is sent across both links (eitehr round-robon or split packet).
> I use MPD's udp transport mode to open two UDP sockets
> and send packets from R1 to R4 and from R2 to R3 (in the diagram
below).
> MPD will automatically detect if on e link is down and redirect
> everything through the remaining link.

Sounds like a good idea, but would that not cause the MTU to get smaller
due to the overhead of a MPPP link?  
Windoze hosts have a horrible time with MTU detection!

> 
> >    I have a private patch that's based on radix_mpath for FreeBSD
5.4.
> >    I believe andre at freebsd.org is working on a solution.
> >
> >    -- Qing
> >
> >
> >-----Original Message-----
> >From: owner-freebsd-questions at freebsd.org [mailto:owner-freebsd-
> questions at freebsd.org] On Behalf Of Webster, Andrew
> >Sent: Wednesday, February 08, 2006 10:51 AM
> >To: danial_thom at yahoo.com; Ian Lord; freebsd-questions at freebsd.org
> >Subject: RE: Multiple routes to same destination?
> >
> >Well, in that case, an ISP wouldn't want to use FreeBSD in their core
> routers :( :(
> >
> >In this particular case, I have redundant links (L1 and L2) between
two
> locations
> >(Loc 1 and Loc 2) with two FreeBSD routers at each location (R1/R2,
and
> R3/R4)
> >which are running OSPF to redistribute routing information between
> locations.
> >Since FreeBSD limits the entries for a particular network to only one
> active entry,
> >the all the traffic for would either go on R1->L1->R4 or R2->L2->R3,
but
> not both.
> >
> >Loc 1___ /---R1--L1--R4---\___ Loc 2
> >	 \---R2--L2--R3---/
> >
> >
> >Andrew
> >
> >_______________________________________________
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> >
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