[OLSR-users] Subnetting an OLSR mesh

[Sven-Ola Tuecke]

Dan,

our pointopoints run in the same address space as all other nodes. To keep 
firewall rules simple - catch them all with a "-s 10(4).0.0.0/8". They use a 
narrower netmask just in case the olsrd gets lost (and no host routes are 
there). The PHY used for transport is unimportant here - means: some of our 
pointopoints are simply ethernet wires.

If olsrd is not present, there will be 2 net devices both with same netmask 
in one box - so it's unpredictable on which iface a packet will be sent. Its 
impossible in this case to contact the box from it's direct neigbour. That 
is the main reason to use a narrow netmask on pointopoint ifaces. Remember: 
Routes for Ifaces with a narrower netmask are placed on higher routing 
presedence - i.e. that pointopoint route will function even if no olsrd 
hostroutes are present.

LG Sven-Ola

""Dan"" <(spam-protected)> schrieb im Newsbeitrag 
news:(spam-protected)
> Hi Sven,
>
> Thanks for your feedback.
>
> In the Berlin mesh, what do you use the x.0.0.0/30 point-to-point links 
> for?
> If they are part of your mesh, why not just integrate them into the mesh 
> and
> run OLSR over them?  Or are they for VPNs to other meshes elsewhere?
>
> Cheers,
>
> Dan
>
> -------------
> View my blog:
> http://freenetjazz.blogspot.com
>
>> -----Original Message-----
>> From: (spam-protected) [mailto:(spam-protected)] On
>> Behalf Of Sven-Ola Tuecke
>> Sent: Tuesday, 15 November 2005 17:29
>> To: (spam-protected)
>> Subject: Re: [OLSR-users] Subnetting an OLSR mesh
>>
>> Dan,
>>
>> 150 is quite ok for one mesh (see below). Do not fiddle with HNAs for 
>> that
>> purpose, just use the multi-interface nodes. For backbone purposes, we
>> have
>> pointopoint-Links with a more narrow netmask here in berlin (that is
>> x.0.0.0/8 for ad-hoc and x.0.0.0/30 for pointopoint). If you plan to link
>> two meshes, it's a good idea to use different IPs in each. Then you can
>> announce one mesh with HNA in the other (and vice versa) on the gateway.
>
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