VPN through NAT -- Resolved
I talked to a cisco tech today. Looks like I can't do it. It seems that the GRE protocol is in Layer 3 which won't work when doing NAT (well PAT because I'm doing NAT overload). So I would have to have an external IP address for every machine that I want to PPTP VPN out to my other machine so that the router could do true NAT. Thanks to all who responded and tried to help me. :-) Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
VPN through NAT
Hello -- Has anyone done this before? I'm trying to get a VPN connection to work over NAT. I see the translation happening, but my PC gets as far as "verifying username/pass" and then it errors out saying the server didn't respond (timeout). show ip nat tra: tcp 3.3.3.3:1056 102.153.102.251:1056 1.1.1.1:1723 1.1.1.1:1723 3.3.3.3 is the IP of my router's internet interface. 102.153.102.251 is my inside IP of my pc. 1.1.1.1 is my VPN server on the internet. If I give my PC an internet IP then it works, so it has something to do with the NAT. No filters are in effect on the interfaces on my router. Thanks! Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: VPN through NAT
Tried that already. Only info I found on there is configuring a PIX firewall VPN tunnel. Searching the CCO is a major pain; you get soo many unrelated hits.. Greg - Original Message - From: "Balharek, Peter" [EMAIL PROTECTED] To: "Greg Smythe" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 1:31 PM Subject: RE: VPN through NAT Try a crazy search on CCO. Type in "nat vpn". Select to search in support. Ohhh. Rtfm -Original Message- From: Greg Smythe [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 30, 2000 12:55 PM To: [EMAIL PROTECTED] Subject: VPN through NAT Hello -- Has anyone done this before? I'm trying to get a VPN connection to work over NAT. I see the translation happening, but my PC gets as far as "verifying username/pass" and then it errors out saying the server didn't respond (timeout). show ip nat tra: tcp 3.3.3.3:1056 102.153.102.251:1056 1.1.1.1:1723 1.1.1.1:1723 3.3.3.3 is the IP of my router's internet interface. 102.153.102.251 is my inside IP of my pc. 1.1.1.1 is my VPN server on the internet. If I give my PC an internet IP then it works, so it has something to do with the NAT. No filters are in effect on the interfaces on my router. Thanks! Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: VPN through NAT
So I can't make a VPN connection to my NT box over NAT.. Well that sucks. Thanks for the info! Greg - Original Message - From: "Ric Messier" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 2:01 PM Subject: Re: VPN through NAT VPNs don't typically work through NAT. The reason is that the packet is altered by the router on the way through the network. As a result, the signature is altered and the packet is discarded as being corrupt. The originating IP is used as part of the authentication mechanism for the packets coming through. It's a security feature. Ric - Original Message - From: "Balharek, Peter" [EMAIL PROTECTED] To: "Greg Smythe" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 4:31 PM Subject: RE: VPN through NAT Try a crazy search on CCO. Type in "nat vpn". Select to search in support. Ohhh. Rtfm -Original Message- From: Greg Smythe [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 30, 2000 12:55 PM To: [EMAIL PROTECTED] Subject: VPN through NAT Hello -- Has anyone done this before? I'm trying to get a VPN connection to work over NAT. I see the translation happening, but my PC gets as far as "verifying username/pass" and then it errors out saying the server didn't respond (timeout). show ip nat tra: tcp 3.3.3.3:1056 102.153.102.251:1056 1.1.1.1:1723 1.1.1.1:1723 3.3.3.3 is the IP of my router's internet interface. 102.153.102.251 is my inside IP of my pc. 1.1.1.1 is my VPN server on the internet. If I give my PC an internet IP then it works, so it has something to do with the NAT. No filters are in effect on the interfaces on my router. Thanks! Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: VPN through NAT
To bring this back into the realm of education and enlightenment, let's look at the design issue. You are going VPN, ie secure tunnel from where to where? Homeinternet-firewall-inside_network is the "standard" configuration, with you the user wanting to work from home for some perverse reason. ;- But in the case you state, it would appear that you the user are in the office, and want to VPN to some other place? Corp_net-internet-some_other_place Now as a matter of security policy, does corp_net want to allow people on the inside to connect snug and secure and private to some unknown place on the outside... say a competitor's network, where you will then transfer company secrets? As a matter of policy, companies might not want traffic whose contents cannot be inspected to be passing through their firewalls. Yes there are all in one products, such as the Checkpoint VPN firewall, which operate in such a manner. Insidecheckpoint-(VPN/NATtunnel/non-tunnel)-internet-someplace_e lse But as a matter of design, NAT not withstanding, it is in my opinion at least, not a good idea to permit unrestricted VPNs from inside to outside. If there are extranets to be considered, then one should design a routing situation in which those who need to connect to particular VPN devices would be routed to particular pieces of equipment, from which the extranet VPN would be established. Inside-firewall---internet |-VPN/extranetbusiness_partner Hey, guys, have I muddied this up enough? :- Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Greg Smythe Sent: Tuesday, May 30, 2000 2:13 PM To: Ric Messier; [EMAIL PROTECTED] Subject: Re: VPN through NAT So I can't make a VPN connection to my NT box over NAT.. Well that sucks. Thanks for the info! Greg - Original Message - From: "Ric Messier" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 2:01 PM Subject: Re: VPN through NAT VPNs don't typically work through NAT. The reason is that the packet is altered by the router on the way through the network. As a result, the signature is altered and the packet is discarded as being corrupt. The originating IP is used as part of the authentication mechanism for the packets coming through. It's a security feature. Ric - Original Message - From: "Balharek, Peter" [EMAIL PROTECTED] To: "Greg Smythe" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 4:31 PM Subject: RE: VPN through NAT Try a crazy search on CCO. Type in "nat vpn". Select to search in support. Ohhh. Rtfm -Original Message- From: Greg Smythe [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 30, 2000 12:55 PM To: [EMAIL PROTECTED] Subject: VPN through NAT Hello -- Has anyone done this before? I'm trying to get a VPN connection to work over NAT. I see the translation happening, but my PC gets as far as "verifying username/pass" and then it errors out saying the server didn't respond (timeout). show ip nat tra: tcp 3.3.3.3:1056 102.153.102.251:1056 1.1.1.1:1723 1.1.1.1:1723 3.3.3.3 is the IP of my router's internet interface. 102.153.102.251 is my inside IP of my pc. 1.1.1.1 is my VPN server on the internet. If I give my PC an internet IP then it works, so it has something to do with the NAT. No filters are in effect on the interfaces on my router. Thanks! Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: VPN through NAT
This is not always the case. Many Cable Modem providers are running NAT for some reason. This can cause grief when trying to work from home with the office. I posted a response earlier but don't see it. I must have used the wrong email address. The only VPN client I know of that will work through NAT is the Altiga (Cisco) VPN Client. It does a raindance around NAT using UDP packets. Kevin At 02:56 PM 5/30/00 -0700, Chuck Larrieu wrote: To bring this back into the realm of education and enlightenment, let's look at the design issue. You are going VPN, ie secure tunnel from where to where? Homeinternet-firewall-inside_network is the "standard" configuration, with you the user wanting to work from home for some perverse reason. ;- But in the case you state, it would appear that you the user are in the office, and want to VPN to some other place? Corp_net-internet-some_other_place Now as a matter of security policy, does corp_net want to allow people on the inside to connect snug and secure and private to some unknown place on the outside... say a competitor's network, where you will then transfer company secrets? As a matter of policy, companies might not want traffic whose contents cannot be inspected to be passing through their firewalls. Yes there are all in one products, such as the Checkpoint VPN firewall, which operate in such a manner. Insidecheckpoint-(VPN/NATtunnel/non-tunnel)-internet-someplace_e lse But as a matter of design, NAT not withstanding, it is in my opinion at least, not a good idea to permit unrestricted VPNs from inside to outside. If there are extranets to be considered, then one should design a routing situation in which those who need to connect to particular VPN devices would be routed to particular pieces of equipment, from which the extranet VPN would be established. Inside-firewall---internet |-VPN/extranetbusiness_partner Hey, guys, have I muddied this up enough? :- Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Greg Smythe Sent: Tuesday, May 30, 2000 2:13 PM To: Ric Messier; [EMAIL PROTECTED] Subject: Re: VPN through NAT So I can't make a VPN connection to my NT box over NAT.. Well that sucks. Thanks for the info! Greg - Original Message - From: "Ric Messier" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 2:01 PM Subject: Re: VPN through NAT VPNs don't typically work through NAT. The reason is that the packet is altered by the router on the way through the network. As a result, the signature is altered and the packet is discarded as being corrupt. The originating IP is used as part of the authentication mechanism for the packets coming through. It's a security feature. Ric - Original Message - From: "Balharek, Peter" [EMAIL PROTECTED] To: "Greg Smythe" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Tuesday, May 30, 2000 4:31 PM Subject: RE: VPN through NAT Try a crazy search on CCO. Type in "nat vpn". Select to search in support. Ohhh. Rtfm -Original Message- From: Greg Smythe [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 30, 2000 12:55 PM To: [EMAIL PROTECTED] Subject: VPN through NAT Hello -- Has anyone done this before? I'm trying to get a VPN connection to work over NAT. I see the translation happening, but my PC gets as far as "verifying username/pass" and then it errors out saying the server didn't respond (timeout). show ip nat tra: tcp 3.3.3.3:1056 102.153.102.251:1056 1.1.1.1:1723 1.1.1.1:1723 3.3.3.3 is the IP of my router's internet interface. 102.153.102.251 is my inside IP of my pc. 1.1.1.1 is my VPN server on the internet. If I give my PC an internet IP then it works, so it has something to do with the NAT. No filters are in effect on the interfaces on my router. Thanks! Greg ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report
