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This turns out to be harder than I thought. The routes I want to delete are the "!" rejected routes, but I can't seem to formulate the right "route del" command to pull it off.

Here is the routing table...

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
67.40.227.206   *               255.255.255.255 UH    0      0        0 ppp0
192.168.46.79   *               255.255.255.255 UH    0      0        0 ipsec0
192.168.46.79   -               255.255.255.255 !H    2      -        0 -
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
10.1.0.0        *               255.255.0.0     U     0      0        0 ipsec0
10.1.0.0        -               255.255.0.0     !     2      -        0 -
default         *               0.0.0.0         U     3      0        0 ppp0
default         *               0.0.0.0         U     4      0        0 ppp0

I have two entries for 192.168.46.79 and 10.1.0.0. These are auto-generated by the little Linux based router I'm using. I can ping the IPSEC tunnels from the shell itself, but traffic from the LAN takes the second route (the rejected "!" or "!H" route) for reasons I simply don't understand.

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Can you be more specific when you say traffic takes the 'second route'? –  Zoredache Sep 14 '10 at 18:18
    
Notice the two table entries for 192.168.46.79? At the router shell, if I ping that side of the tunnel it works. From the LAN-side, traffic goes to the "second 192.168.46.79" entry and is rejected/drops. –  user54259 Sep 14 '10 at 19:52
    
I also don't understand why the SG560 generates two (2) table entries for "default" and the IPSEC destinations. I'm perplexed. –  user54259 Sep 14 '10 at 19:53
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2 Answers

The types of the routes with the ! flag are either unreachable or prohibit. route, being an ancient utility from net-tools, does not differentiate between the two. Use iproute2.

The net-tools way to delete these routes would be to use route del on it. However, net-tools provides no way to differentiate between the rejected route and the other one (because the dev argument is optional, though not specifying a device is likely to remove the unreachable route).

iproute2 allows you to do it like this:

ip route del unreachable 10.1.0.0/24
ip route del unreachable 192.168.46.79/32

It might not be unreachable, but prohibit. Use ip route with no arguments to determine which.

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I think it's this: route del -net 10.1.0.0 netmask 255.255.0.0 metric 2

I'm not 100% certain. But, I think you've got something else goofy going on since you have 2 default routes.

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+1 : 2 default routes is always a sign of something being misconfigured (unless they actually point to different gateways and have different metrics). –  wolfgangsz Sep 14 '10 at 21:20
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