IPSec woes - problems after the installation of firewall between IPSec endpoints

Hi all

I recently had to install some pix from our internet router to some internal routers in a branch. A small preview:

router Internet <-->PIX pair FO <-NAT->routers <-->Switch Fabric

Basically, internal routers used to have interfaces with IPs turned to the audience of our external block. I had 2 tunnels GRE IPSec running on one of them and had users who log in to the House through 1721 s. Since we have very little space, I had public address the PIX redirect internal routers and go from there.

So, here's where I am--my tunnels show top/towards the top, but I can't talk about anything that either internally sent by routers. All this worked * prior * me having to redirect internal routers to get the firewall in. I'll post all three configs (firewall, router, router internal) to cleaned formats such as text attachments. Note, also, that I left the pix traffic large shipping open until I can solve this problem. I'll reapply my more restrictive ACL when this is fixed.

Just as a point of reference:

200.200.200.200 - static IP router (by ISP)

100.100.100.100 - public ip address who * was * on our external interface of our internal router, which is now on the pix as a static to the new ip address of the router.

172.18.201.0/24--Le internal network, I created to re - treat routers to be originally the inside interface of the pix

Example of House is the remote router of 1721, the Interior router example is the internal router and firewall example is our pix 525 just installed.

I would like to know if there is more I should include...

Thanks in advance!

-Tim

The statement of the route on the pix will require the subnet mask:

Route inside 100.100.100.100 255.255.255.255 172.18.201.4

After you change the static method, remember to do a clear xlate on the pix: clear xlate local 172.18.201.4

You don't need to assign the card encryption at int of closure. If you do, these are in global configuration on the router mode:

card crypto mapname-address loobackx, where x is the number of loopback, and mapname is the name of your crypto card (homevpn, I think it was). If the local address is not the right option, simply enter the card encryption? to invite the global configuration and you should see text referring to the allocation of an IP as source for traffic using ipsec.

Notes:

1. on the router tunnel interface will use the same loopback interface as its source too. With the card encryption applied to the actual physical interface routing if you do not have to create maps of route to route to the closure to apply ipsec processing.

This should take care of the GRE and IPSec traffic. Is there any other traffic should I consider?

Take care to archive the current configs on the internal router and pix before you make these changes to restore more easily to the case where things go wrong.

Tags: Cisco Security

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