Multiple routes to same destination

[Julian Elischer]

Webster, Andrew wrote:

>>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 think you can now do mtu munging in teh newer mpd
if not you could use the daemon to do it from ports.

>  
>
>>>   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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>  
>
>>>      
>>>
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>>    
>>
>
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