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No https internet traffic passing through Cisco IPSEC vpn??.

Posted on 2004-10-04
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Last Modified: 2010-04-12
Hello!!

I have a strange issue to ask you about... I have installed two cisco 837 routers with an IPSEC vpn tunnel between the two. The tunnel works absolutly fine. End A is our head office and end B is a remote site.

I want all internet access from end B to pass through the vpn and exit from our firewall at the A end so we can control traffic. To achive this I have configured a default route in the B end;

ip route 0.0.0.0 0.0.0.0 dialer 1

At the A end router I have configured a route back to router B's LAN through dialer 1 and a default route out to our firewall.

I.e
ip route 10.1.0.0 0.0.0.255 dialer 1
ip route 0.0.0.0 0.0.0.0 10.2.0.1 (Our firewall)

From end B i can now surf the internet fine through the vpn (I have used tracert to make sure). It works until I try to access a secure https site. Nothing happens and I eventually get the dredded microsoft "this page cannot be displayed" message. I'm pretty sure it's not an access list issue because in the cause of testing i have taken them off of all interfaces and it still doesnt work.

I have also applied a logged access list on the A end's e0 interface and I can see http traffic coming in and out. But no https port 443!!

Any ideas what this might be chaps?  Thanks for your help. This ones worth 500 to ya. Ta! :)


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Question by:needsy
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lrmoore earned 500 total points
ID: 12222491
MTU

Since you have DSL between the sites, you have a fragmentation before encryption issue..
Take a look at the issues here:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5012/prod_release_note09186a008015ce50.html

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