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OSPF Routing and the PIX535

Posted on 2004-10-08
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Last Modified: 2010-04-09
Isn't there a way to set up default routes for the outside and inside interfaces rather than having 800 routing entries in the firewall?  Can this be done by only making changes on the pix?

This is what I have:

routing interface outside
  ospf authentication null
routing interface inside
  ospf authentication null
route outside 0.0.0.0 0.0.0.0 150.113.8.193 5
route outside 10.0.0.0 255.0.0.0 150.113.8.193 1
route outside X.X.X.X 255.255.255.255 150.113.8.193 1
plus about 200 more routes that begin with route outside
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Question by:sunnyd24
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lrmoore earned 500 total points
ID: 12262016
>route outside 0.0.0.0 0.0.0.0 150.113.8.193 5 <== the "5" should be replaced with "1"

This global default trumps all the rest and no others are necessary, but I'll bet the others were entered because the default didn't work because of the "5". This is a hop-count, not a cost metric on a PIX..

So, what's your question on OSPF here?

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by:sunnyd24
ID: 12262366
I guess I didn't really have a question about OSPF.  I just don't understand PIX routing very well.  Is the hop count to the first router or the first switch?  Thanks for the quick reply!
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by:lrmoore
ID: 12262456
The Hop count should always be 1, meaning that the next hop is on the same connected interface - only one hop away
Not the same physical interface, but on the same logical IP subnet/ VLAN whatever.. A traceroute to that IP shows it as only one L3 hop..
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by:sunnyd24
ID: 12262720
Our HP openview goes red when I take out all the other route outside entries.  They all have the same IP 150.113.8.193.  However we are still able to get out to the internet and the only path is through the firewall.  Any ideas?
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Author Comment

by:sunnyd24
ID: 12262727
HP openview is just pinging the network devices beyond the firewall.
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by:lrmoore
ID: 12262775
Did you change the metric on the default?

Do you have proxyarp disabled?

That just does not make sense if they are all pointing to the same upstream router...
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Author Comment

by:sunnyd24
ID: 12262804
Yes I changed the 5 to a 1

as far as proxyarp these are the entries I have:
sysopt noproxyarp outside
sysopt noproxyarp inside

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Expert Comment

by:lrmoore
ID: 12262838
Do you have any other firewalls in the mix?
Suggest enabling proxyarp on the inside interface (unless you have some "alias" commands)

   no sysopt noproxyarp inside
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Author Comment

by:sunnyd24
ID: 12263040
There is only the 535 w/failover and there are no alias commands.

I haven't been able to find much on the proxyarp.  Is there any more to enabling Proxyarp than:

no sysopt noproxyarp inside

?
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Expert Comment

by:lrmoore
ID: 12263117
That's all there is to it..

If that's the only firewall you have, I would enable it on both interfaces. I think you'll be happier with the results.
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by:sunnyd24
ID: 12263143
Great thanks for all your help!  That solved the problem.  
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Expert Comment

by:lrmoore
ID: 12263151
Glad to help!
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