From: Bogdan Sass (bogdan.sass@catc.ro)
Date: Mon Oct 27 2008 - 17:58:33 ARST
Victor Cappuccio wrote:
> Bogdan,
>
> Because PPP allocates his clientes a /32, and you would receive
> something like
> OSPF: Rcv pkt from 0.0.0.0 <http://0.0.0.0>, Virtual-Access1.1, area
> 0.0.0. <http://0.0.0.> 0 : src not on the same network, PPP doesn't
> have any option to negotiate the mask information and will always use
> a /32 bit mask when IP address that was negotiated.
>
> /32 is 1 host, and OSPF would complain that the remote is not on the
> same subnet
>
> if you need to run OSPF there, if you've misconfigured the OSPF
> interface parameters the timers or the subnet mask you would have a
> problem to establish OSPF Adjacency, I notice also that if you have a
> mismatched IP subnets (not the subnet mask) on adjacent routers, you
> will not see any received hello packets,
> it is better to use the DHCP-Pool (local to the router) DHCP (to use
> the router as a proxy client to allocate a peer ip address) to receive
> whatever you have configured as the subnet mask in the dhcp request,
> the way to perform these task
>
> R1(config-if)#interface Virtual-Template1
> R1(config-if)#ip address 10.10.10.1 <http://10.10.10.1> 255.255.255.0
> <http://255.255.255.0>
> R1(config-if)#peer default ip address ?
> dhcp Use DHCP proxy client mechanism to allocate a peer IP address
> dhcp-pool Use local DHCP pools to allocate a peer IP address
> pool Use IP pool mechanism to allocate a peer IP address
>
> Remember that OSPF needs both the ends in the same network to form
> neighbour relationship. Just something I saw while teaching ISCW, and
> a student asked to configure ospf there, also is clear that we have
> would have an MTU Issue there.
>
> HTH
> Victor.-
Thank you very much! The reason I was asking was that I ran into a
(somewhat) similar problem during my preparation for the CCIE lab :)
From what I've been reading on the list lately, it looks like
setting the ospf network to point-to-point type might also be a solution
to this?
-- Bogdan Sass CCAI,CCSP,JNCIA-ER,CCIE #22221 (RS) Information Systems Security Professional "Curiosity was framed - ignorance killed the cat"Blogs and organic groups at http://www.ccie.net
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