Static Route that won't go away

Static Route that won't go away
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Subject Author Date
Static Route that won't go away K.J. 44 09-08-2006
Posted by K.J. 44 on September 8, 2006, 11:18 am
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Hi,

I have a static route in my router that I don't remember putting there.
It is to a public address.

The problem is that when I do a no ip route it says No Matching Route
To Delete.

This is the network that i get my public IPs from and the next hop in
the static route is incorrect. It is the network address of my
block of IPs from my ISP, which of course is not assigned anywhere. So
whenever I go to a site that starts with the same network address, it
doesn't go through.

When I add a static route with the next hop correct, both routes exist
in the routing table and it load balances across both links, meaning
that when I ping addresses with the same network address, half of them
make it and the other half do not.

Has anyone ever seen this? Why can't I get rid of the route?

Thanks.


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Posted by Walter Roberson on September 8, 2006, 11:49 am
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>I have a static route in my router that I don't remember putting there.
> It is to a public address.

>The problem is that when I do a no ip route it says No Matching Route
>To Delete.

That -usually- indicates that it is a Connected route, generated
automatically because the interface is in that subnet.

Could you show us your routing table (suitably obscured so that
we can tell which route is which) ?

Posted by K.J. 44 on September 8, 2006, 11:59 am
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Here it is:

Gateway of last resort is PUBLIC.IP.NETWORK.ADDRESS+1 to network
0.0.0.0

PUBLIC IP.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS
C PUBLIC.IP.NETWORK.ADDRESS/30 is directly connected,
FastEthernet 0/1
PRIVATE.IP.ADDRESS.0/30 is subnetted, 1 subnets
C PRIVATE.IP.ADDRESS.0 is directly connected, FastEthernet0/0
S* 0.0.0.0/0 [1/0] via PUBLIC.IP.NETWORK.ADDRESS+1

Hopefully that is obscure enough and not too confusing
S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS

This is the route to get rid of. When I go to other sites with the
same first PUBLIC IP it won't go through. However if I add a static
route that looks like this:

S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS+1

It load balances across the links and half of the packets make it.

Thanks in advance.

Walter Roberson wrote:
>
> >I have a static route in my router that I don't remember putting there.
> > It is to a public address.
>
> >The problem is that when I do a no ip route it says No Matching Route
> >To Delete.
>
> That -usually- indicates that it is a Connected route, generated
> automatically because the interface is in that subnet.
>
> Could you show us your routing table (suitably obscured so that
> we can tell which route is which) ?


Posted by Barry Margolin on September 8, 2006, 9:15 pm
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> Here it is:
>
> Gateway of last resort is PUBLIC.IP.NETWORK.ADDRESS+1 to network
> 0.0.0.0
>
> PUBLIC IP.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
> S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS
> C PUBLIC.IP.NETWORK.ADDRESS/30 is directly connected,
> FastEthernet 0/1
> PRIVATE.IP.ADDRESS.0/30 is subnetted, 1 subnets
> C PRIVATE.IP.ADDRESS.0 is directly connected, FastEthernet0/0
> S* 0.0.0.0/0 [1/0] via PUBLIC.IP.NETWORK.ADDRESS+1
>
> Hopefully that is obscure enough and not too confusing
> S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS
>
> This is the route to get rid of. When I go to other sites with the
> same first PUBLIC IP it won't go through. However if I add a static
> route that looks like this:
>
> S PUBLIC IP.0.0.0/8 [1/0] via PUBLIC.IP.NETWORK.ADDRESS+1
>
> It load balances across the links and half of the packets make it.

My guess is that the bad route is being created automatically due to
some kind of auto-summary, although I thought that only applied to
routing protocols, not static routing.

Do you have "ip classless" configured? If not, maybe that's causing a
route for the /8 of your outside network to be created automatically.

--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

Posted by erik.freitag@pobox.com on September 9, 2006, 2:13 am
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K.J. 44 wrote:
> Hi,
>
> I have a static route in my router that I don't remember putting there.
> It is to a public address.
>
> The problem is that when I do a no ip route it says No Matching Route
> To Delete.
>
> This is the network that i get my public IPs from and the next hop in
> the static route is incorrect. It is the network address of my
> block of IPs from my ISP, which of course is not assigned anywhere. So
> whenever I go to a site that starts with the same network address, it
> doesn't go through.
>
> When I add a static route with the next hop correct, both routes exist
> in the routing table and it load balances across both links, meaning
> that when I ping addresses with the same network address, half of them
> make it and the other half do not.
>
> Has anyone ever seen this? Why can't I get rid of the route?

Any chance you could post the config? Obfuscate as necessary, but too
much cleverness might mask the problem.


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