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RFC 3021 - Point-to-Point (/31) Networks

point-to-point subnet 2-ip 3021 /31 directly attached network

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#1 John K. Mes

John K. Mes
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Posted 19 August 2013 - 03:11 PM

Howdy! After struggling with this for a while - and with lots of help from 'Cuda engineers & support - I have a working point-to-point network. There seems the be a real lack of info (or demand) on this topic, but surely I can't be the only one.....

For those of you in limited-IP situations and a provider who uses Cisco, this may help you.

Our situation: point-to-point networks need special configuration in the NG since it doesn't like /31 in the standard networking setup. (Point-to-point only allows 2 addresses.)

Basic idea: you don't tell the NG that it is on a /31 network. Only create 'directly attached network' entries.

Working setup (for us, not our real addresses):
- Network: 10.10.10.10/31
- Provider IP: 10.10.10.10 <provider-address>
- S1 First-IP: 10.10.10.11 <local-address>
- Default gateway: 10.10.10.10
- Firmware GWAY-5.4.1-194 (running on an F800)

1. Configure the default route.
- Target network: <0.0.0.0/0>
- Route type: <gateway>
- Interface name: <blank>
- Gateway: <provider-address>
- Route metric: <leave blank>
- Source address: <local-address>
- Trust level: <untrusted>
- Active: <yes>

2. Configure the network entry for upstream provider
- Target network address: <provider-address> !! address only, do not enter slash notation !!
- Route type: <directly attached network>
- Interface name: <connected interface, for us, B1>
- Gateway: <blank>
- Route metric: <blank>
- Source address: <blank>
- Trust level: <blank>
- Default gateway: <blank>
- Active: <yes>

3. Configure the network entry for the local address
- Target network address: <local-address> !! address only, do not enter slash notation !!
- Route type: <directly attached network>
- Interface name: <connected interface, for us, B1>
- Gateway: <blank>
- Route metric: <blank>
- Source address: <blank>
- Trust level: <Trusted>
- Default gateway: <blank>
- Active: <yes>

One problem I noticed is that the provider needed to have ping response turned on, otherwise the NG would set the gateway state to "down" (as seen in Control-> Network-> Interfaces). So, no ping = no gateway. Otherwise, happiness!

Cheers!





Also tagged with one or more of these keywords: point-to-point, subnet, 2-ip, 3021, /31, directly attached network