Full Disclosure mailing list archives
Re: Cisco support multiple pptp (GRE) Channels ?
From: "Joseph Karpenko \(jkarpenk\)" <jkarpenk () cisco com>
Date: Wed, 15 Aug 2007 11:12:27 -0700
-----Original Message----- From: full-disclosure-bounces () lists grok org uk [mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of Michael Gale Sent: Wednesday, August 15, 2007 12:42 PM To: full-disclosure () lists grok org uk Subject: [Full-disclosure] Cisco support multiple pptp (GRE) Channels ? Hey, Does anyone know if a Cisco firewall can support multiple PPTP (GRE) channels from internal clients to a single external server ?
yes, you'd need to have 1-1 NAT translations for the clients behind the firewall.
--snip-- Right now the PPTP server is on the public network and it is working correctly for connections from all clients. We have a private network from behind a firewall, let's call it firewall A. A single client from behind firewall A can connect with out a problem, however if a second client tries to connect from behind firewall A it looks like firewall A does not forward the PPP LCP packets. Am I correct that mutliple GRE (proto 47) tunnels would be a problem when the clients have the same IP address?
you got it, there is nothing to identify and differentiate the flows - hence the reason the PPTP clients need 1-1 NATs. -- karpenko
--snip-- -- Michael Gale Red Hat Certified Engineer Network Administrator Pason Systems Corp. "What we need are more people who specialize in the impossible." - Theodore Roethke _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
_______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- Cisco support multiple pptp (GRE) Channels ? Michael Gale (Aug 15)
- Re: Cisco support multiple pptp (GRE) Channels ? Joseph Karpenko (jkarpenk) (Aug 15)