/30s are the simplest, you can use /32 addressing on the link between the two MTs. Or get a radio that is smart enough to handle two gateways with checks ☺ Out of band management radios are better yet /☺
[DennisBurgessSignature] www.linktechs.net<http://www.linktechs.net/> – 314-735-0270 x103 – dmburg...@linktechs.net<mailto:dmburg...@linktechs.net> From: Af [mailto:af-boun...@afmug.com] On Behalf Of Cassidy B. Larson Sent: Thursday, August 11, 2016 4:10 PM To: af@afmug.com Subject: Re: [AFMUG] Access Both Sides of Downed Link Using OSPF? A lot of times we want to login to side “B” when the link between A and B is down…but we can’t unless each side is advertised as a /30..but I want the two radio’s to see each other when they’re up. So what I’ve done most recently is: .1 = Router A (configured as /30) .2 = Radio A (configured as /29, GW set to .1) .5 = Radio B (configured as /29 GW set to .6) .6 = Router B (configured as /30) Then I just run OSPF on a separate /30 across that path on a separate VLAN. The above is just for MGMT of the radios. On Aug 11, 2016, at 3:02 PM, Christopher Gray <cg...@graytechsoftware.com<mailto:cg...@graytechsoftware.com>> wrote: How do you setup radio addresses so both ends of a link can be accessed (via loop) when the link is down? What I've been doing... and how it doesn't work: I've been setting up OSPF links using a /29. Router A -- Radio A ~~ Radio B -- Router B Devices get addresses: * .1 - Router A * .2 - Router B * .3 - Radio A (Gateway set to .1) * .4 - Radio B (Gateway set to .2) * .5 - Spare (used when swapping links) * .6 - Spare (used when swapping links) This feels very clean, and works nicely when the link is up or when there is no network loop. However, when the link goes down, if I am connected near Router A, all traffic for that /29 is routed through Router A, and I have no access to the B side. Then, I can only access the B side if I connect closer to Router B. Suggestions? Thanks - Chris
