Firewall Wizards mailing list archives
Re: VPN/DMZ problem
From: "ॐ aditya mukadam ॐ" <securescorp () gmail com>
Date: Fri, 5 Sep 2008 15:52:29 +0530
Ian, If you can get to the LAN resources and not to the DMZ resources, you would need to check on : 1) Split tunneling : DMZ subnets should be allowed. 2) NAT 0 statement should be configured for traffic between DMZ and pool IP 3) Make sure there is a return route on the destination ( jus to check...i understand that the default gateway on the DMZ devices would be the PIX interface) 4) Check your machine's routing table for any static routes for the destination subnets conflicting. Pointers to troubleshoot: * Atter connecting the VPN, send continuous ping to the DMZ destination. Check on the VPN clients statistics if the packets are getting encrypted. If you donot see the encrypted packets increasing, then you have a local issue. It is either with split tunneling subnet or a route on your local PC. If you can see encrypted count incresing ...then the next step would be to check on the PIX. Running wireshark on the virtual adapter will be useful as well. * do a sh crypto ipsec sa on the PIX. Check if you see traffic decrypting. If there is an issue with return route, you would see decrypts but no encrypts ! * You can run the command ' man-<interface name> command. By doing this you can ping the PIX DMZ interface itself and troueblshoot.Thsi will isolate issue with the return route etc on the destination network. ( eg: your case it would be man-Perimeter ) Hope this helps. Let me know the results and we will take next actions(fi needed) Thanks, Adi On Thu, Sep 4, 2008 at 10:37 AM, Christopher J. Wargaski <wargo1 () gmail com> wrote:
Hey Ian-- Are you using split-tunneling with the VPN? If so, make sure that the ACL permits the DMZ. On Tue, Sep 2, 2008 at 5:06 AM, Ian Rarity <Ian.Rarity () espc com> wrote:Hi, We're having a problem with our VPN; we have a PIX 515E with 4 interfaces: Inside (security100) - Our internal LAN, 150.150.10.0/24 Outside (security0) - The Internet Perimeter (security50) - DMZ, 172.16.1.0/24 Innerperimeter (security75) - "Inner" DMZ, 150.150.11.0/24 The VPN is a certificate/token-based set up, with VPN users being assigned addresses from 150.150.62.0/24 (don't ask me about the weird addressing scheme; it was like that when I got here). The problem we're having is that VPN users can't access hosts in either of the DMZs, although they can see LAN hosts just fine. I'm assuming that this is because the VPN traffic is coming in through the PIX's "outside" interface, and the usual rule about traffic from interfaces with a lower security level going to an interface with a higher one is applying. I've tried to override this with another access list, by "nat 0"-ing the two DMZ interfaces, but external VPN users still can't see hosts in the DMZs. Obviously I'm screwing up somewhere, but I'd be very grateful if someone could tell me how. Ta, IR. ******************************************************************* Private and Confidential: This e-mail transmission is strictly confidential and intended solely for the addressee. It may contain privileged and confidential information and if you are not the intended recipient, you must not copy, disclose, distribute or take any action in reliance on it. If you have received this e-mail in error, please delete it and notify our E-mail Systems Administrator on +44 (0) 131 624 8000. ESPC (UK) Ltd does not accept any liability for any harm that may be caused to the recipient's system or data by this message or any attachment. ESPC (UK) Ltd is a company registered under the Companies Acts in Scotland (Registered Number SC203535), and having its registered office at 90A George Street, Edinburgh, Midlothian EH2 3DF. ESPC (UK) Limited is authorised and regulated by the Financial Services Authority. _______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards_______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards
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Current thread:
- VPN/DMZ problem Ian Rarity (Sep 03)
- Re: VPN/DMZ problem Chris Myers (Sep 04)
- Re: VPN/DMZ problem Christopher J. Wargaski (Sep 04)
- Re: VPN/DMZ problem Ian Rarity (Sep 10)
- Re: VPN/DMZ problem ॐ aditya mukadam ॐ (Sep 10)