I'm having trouble with GRE through a VPN. The setup is 2600->PIX->VPN3K->2600. The problem seems to be the pix needs the crypto acl defined with GRE protocol 47, while the concentrator only seems to support ip in the network lists. This causes the pix to fail on proxy identities. Any ideas or direction? Thanks.
I have seen this before. You just need to include "ip" under your PIX proxy ID ACL... It will encrypt the GRE traffic. The concentrator will not support a Proxy ID as protocol 47 (GRE) only IP (as you mentioned). Consequently, the only solution is to configure "ip" under the PIX crypto ACL...
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...