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Accepted
Mark Henderson
Asked: 2011-12-13 12:55:21 +0800 CST

RRAS won't route with a /23, but will with two /24

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I've had a route in Windows Server 2008 R2 RRAS that's been working for a long time, which is 192.168.100.0/24.

The network on the other side of that link recently added a new subnet, 192.168.101.0/24

So, naturally I thought to myself, I would just modify the existing route to the following:

192.168.100.0/23

But no go. Nothing on the new subnet goes anywhere.

But, if I make the following setup:

192.168.101.0/24

Which is effectively the same route as above, just more verbose, works perfectly.

I don't mind having the two routes, but I'd really like to know why it's nessesary. Any ideas?

rras windows-server-2008-r2

1 Answers

  1. Best Answer

    If you look at the route table with route print does it show things correctly when you have the /23 route? Does a traceroute show the traffic trying to leave the correct interface?

    Some times what you see in the Windows GUI does not reflect what Windows is actually doing. I find that it is always best to double check from the command line.

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