The VPN client VPN connection behind other PIX PIX

I have the following problem:

I wanted to establish the VPN connection the client VPN to PIX on GPRS / 3G, but I didn t have a bit of luck with PIX IOS version 6.2 (2).

So I upgraded PIX to 6.3 (4) to use NAT - T and VPN client to version 4.0.5

I have configured PIX with NAT-T(isakmp nat-traversal 20), but I still had a chance, he would not go through the 1st phase. As soon as I took nat-traversal isakmp off he started working, and we can connect to our servers.

Now, I want to connect to the VPN client behind PIX to our customer PIX network. VPN connection implements without problem, but we can not access the servers. If I configure NAT - T on the two PIX, or only on the customer PIX or only on our PIX, no VPN connection at all.

If I have to connect VPN client behind PIX to the customer's network and you try to PING DNS server for example, on our PIX, I have following error:

305006: failed to create of portmap for domestic 50 CBC protocol translation: dst outside:194.x.x.x 10.10.1.x

194.x.x.x is our customer s address IP PIX

I understand that somewhere access list is missing, but I can not understand.

Of course, I can configure VPN site to site, but we have few customers and take us over their servers, so it'd just connect behind PIX VPN and client connection s server, instead of the first dial-in and then establish a VPN connection.

Can you please help me?

Thank you in advan

The following is extracted from ASK THE DISCUSSION FORUM of EXPERTS with Glenn Fullage of Cisco.

I've cut and pasted here for you to read, I think that the problem mentioned below:

Question:

Hi Glenn,.

Following is possible?

I have the vpn client on my PC, my LAN is protected by a pix. I can launch the vpn client to connect to remote pix. Authenticates the vpn client and the remote pix makes my PC with the assigned ip appropriate to its pool of ip address.

The problem that I am facing is that I can not anything across the pix remote ping from my PC which is behind my pix. Can you please guide me what I have to do to make this work, if it is possible?

My PC has a static ip address assigned with the default gateway appropriate pointing to my s pix inside interface.

Thank you very much for any help provided in advance.

Response from Glenn:

First of all, make sure that the VPN connection works correctly when the remote PC is NOT behind a PIX. If that works fine, but then breaks when put behind a PIX, it is probably that the PIX is PAT, which usually breaks IPSec. Add the following command on your PIX VPN client is behind:

fixup protocol esp-ike

See http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/cmdref/df.htm#wp1067379 for more details.

If it still has issues, you can turn on NAT - T on the remote PIX that ends the VPN, the client and the remote PIX must encapsulate then all IPSec in UDP packets that your PIX will be able to PA correctly. Add the following command on the remote PIX:

ISAKMP nat-traversal

See http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/cmdref/gl.htm#wp1027312 for more details.

NAT - T is a standard for the encapsulation of the UDP packets inot IETF IPSec packets.

ESP IPSec (Protocol that use your encrypted data packets) is an IP Protocol, it is located just above IP, rather than being a TCP or UDP protocol. For this reason, it has no TCP/UDP port number.

A lot of features that make the translation of address of Port (PAT) rely on a single to PAT TCP/UDP source port number ' ing. Because all traffic is PAT would be at the same source address, must be certain uniqueness to each of its sessions, and most devices use the port number TCP/UDP source for this. Because IPSec doesn't have one, many features PAT fail to PAT it properly or at all, and the data transfer fails.

NAT - T is enabled on both devices of the range, they will determine during the construction of the tunnel there is a PAT/NAT device between them, and if they detect that there is, they automatically encapsulate every IPSec packets in UDP packets with a port number of 4500. Because there is now a port number, PAT devices are able to PAT it correctly and the traffic goes normally.

Hope that helps.

Tags: Cisco Security

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    54 packets captured
    1: 15:43:51.112054 10.1.1.82.1608 > 76.196.10.57.443: S 1763806634:1763806634 (0) win 64240
    2: 15:43:54.143028 10.1.1.82.1608 > 76.196.10.57.443: S 1763806634:1763806634 (0) win 64240
    3: 15:44:00.217273 10.1.1.82.1608 > 76.196.10.57.443: S 1763806634:1763806634 (0) win 64240
    4: 15:44:01.724938 10.1.1.82.1609 > 76.196.10.57.60443: S 2904546955:2904546955 (0) win 64240
    5: 15:44:01.784642 76.196.10.57.60443 > 10.1.1.82.1609: S 2323205974:2323205974 (0) ack 2904546956 win 5808
    6: 15:44:01.784886 10.1.1.82.1609 > 76.196.10.57.60443:. ACK 2323205975 win 64240
    7: 15:44:01.785527 10.1.1.82.1609 > 76.196.10.57.60443: P 2904546956:2904547080 (124) ack 2323205975 win 64240
    8: 15:44:01.856462 76.196.10.57.60443 > 10.1.1.82.1609:. ACK 2904547080 win 5808
    9: 15:44:01.899596 76.196.10.57.60443 > 10.1.1.82.1609: P 2323205975:2323206638 (663) ack 2904547080 win 5808
    10: 15:44:02.056897 10.1.1.82.1609 > 76.196.10.57.60443:. ACK 2323206638 win 63577
    11: 15:44:03.495030 10.1.1.82.1609 > 76.196.10.57.60443: P 2904547080:2904547278 (198) ack 2323206638 win 63577
    12: 15:44:03.667095 76.196.10.57.60443 > 10.1.1.82.1609:. ACK 2904547278 win 6432
    13: 15:44:03.740592 76.196.10.57.60443 > 10.1.1.82.1609: P 2323206638:2323206697 (59) ack 2904547278 win 6432
    14: 15:44:03.741264 10.1.1.82.1609 > 76.196.10.57.60443: P 2904547278:2904547576 (298) ack 2323206697 win 63518
    15: 15:44:03.814029 76.196.10.57.60443 > 10.1.1.82.1609:. ACK 2904547576 win 7504
    16: 15:44:06.989008 76.196.10.57.60443 > 10.1.1.82.1609: P 2323206697:2323207075 (378) ack 2904547576 win 7504
    17: 15:44:06.990228 76.196.10.57.60443 > 10.1.1.82.1609: 2323207075:2323207075 F (0) ack 2904547576 win 7504
    18: 15:44:06.990564 10.1.1.82.1609 > 76.196.10.57.60443:. ACK 2323207076 win 63140

    19: 15:44:06.990656 10.1.1.82.1609 > 76.196.10.57.60443: P 2904547576:2904547613 (37) ack 2323207076 win 63140
    20: 15:44:06.990854 10.1.1.82.1609 > 76.196.10.57.60443: 2904547613:2904547613 F (0) ack 2323207076 win 63140
    21: 15:44:07.049359 76.196.10.57.60443 > 10.1.1.82.1609: R 2323207076:2323207076 (0) win 0
    22: 15:44:17.055417 10.1.1.82.500 > 76.196.10.57.500: udp 276
    23: 15:44:17.137657 76.196.10.57.500 > 10.1.1.82.500: udp 140
    24: 15:44:17.161475 10.1.1.82.500 > 76.196.10.57.500: udp 224
    25: 15:44:17.309066 76.196.10.57.500 > 10.1.1.82.500: udp 220
    26: 15:44:17.478780 10.1.1.82.4500 > 76.196.10.57.4500: udp 80
    27: 15:44:17.550356 76.196.10.57.4500 > 10.1.1.82.4500: 64 udp
    28: 15:44:17.595214 10.1.1.82.4500 > 76.196.10.57.4500: udp 304
    29: 15:44:17.753470 76.196.10.57.4500 > 10.1.1.82.4500: udp 304
    30: 15:44:17.763037 10.1.1.82.4500 > 76.196.10.57.4500: udp 68
    31: 15:44:17.763540 10.1.1.82.4500 > 76.196.10.57.4500: udp 56
    32: 15:44:18.054516 10.1.1.82.4500 > 76.196.10.57.4500: udp 68
    33: 15:44:18.124840 76.196.10.57.4500 > 10.1.1.82.4500: udp 68
    34: 15:44:21.835390 10.1.1.82.4500 > 76.196.10.57.4500: udp 72
    35: 15:44:21.850831 10.1.1.82.4500 > 76.196.10.57.4500: udp 80
    36: 15:44:21.901183 76.196.10.57.4500 > 10.1.1.82.4500: udp 72
    37: 15:44:22.063747 10.1.1.82.1610 > 76.196.10.57.60443: S 938188365:938188365 (0) win 64240
    38: 15:44:22.104746 76.196.10.57.4500 > 10.1.1.82.4500: udp 80
    39: 15:44:22.122277 76.196.10.57.60443 > 10.1.1.82.1610: S 1440820945:1440820945 (0) ack 938188366 win 5808
    40: 15:44:22.122536 10.1.1.82.1610 > 76.196.10.57.60443:. ACK 1440820946 win 64240
    41: 15:44:22.123269 10.1.1.82.1610 > 76.196.10.57.60443: P 938188366:938188490 (124) ack 1440820946 win 64240
    42: 15:44:22.187108 76.196.10.57.60443 > 10.1.1.82.1610:. ACK 938188490 win 5808
    43: 15:44:22.400675 76.196.10.57.60443 > 10.1.1.82.1610: P 1440820946:1440821609 (663) ack 938188490 win 5808
    44: 15:44:22.474600 10.1.1.82.1610 > 76.196.10.57.60443: P 938188490:938188688 (198) ack 1440821609 win 63577
    45: 15:44:22.533648 76.196.10.57.60443 > 10.1.1.82.1610:. ACK 938188688 win 6432
    46: 15:44:22.742286 76.196.10.57.60443 > 10.1.1.82.1610: P 1440821609:1440821668 (59) ack 938188688 win 6432
    47: 15:44:22.742927 10.1.1.82.1610 > 76.196.10.57.60443: P 938188688:938189002 (314) ack 1440821668 win 63518
    48: 15:44:22.802570 76.196.10.57.60443 > 10.1.1.82.1610:. ACK 938189002 win 7504
    49: 15:44:25.180486 76.196.10.57.60443 > 10.1.1.82.1610: P 1440821668:1440821934 (266) ack 938189002 win 7504
    50: 15:44:25.181753 76.196.10.57.60443 > 10.1.1.82.1610: 1440821934:1440821934 F (0) ack 938189002 win 7504
    51: 15:44:25.181997 10.1.1.82.1610 > 76.196.10.57.60443:. ACK 1440821935 win 63252
    52: 15:44:25.182134 10.1.1.82.1610 > 76.196.10.57.60443: P 938189002:938189039 (37) ack 1440821935 win 63252
    53: 15:44:25.182333 10.1.1.82.1610 > 76.196.10.57.60443: 938189039:938189039 F (0) ack 1440821935 win 63252
    54: 15:44:25.241869 76.196.10.57.60443 > 10.1.1.82.1610: R 1440821935:1440821935 (0) win 0

    #2: same PC with Dynamic NAT, VPN connection fails:

    70 packets captured
    1: 14:08:31.758261 10.1.1.82.1073 > 76.196.10.57.443: S 820187495:820187495 (0) win 64240
    2: 14:08:34.876907 10.1.1.82.1073 > 76.196.10.57.443: S 820187495:820187495 (0) win 64240
    3: 14:08:40.746055 10.1.1.82.1073 > 76.196.10.57.443: S 820187495:820187495 (0) win 64240
    4: 14:08:42.048627 10.1.1.82.1074 > 76.196.10.57.60443: S 3309127022:3309127022 (0) win 64240
    5: 14:08:42.120248 76.196.10.57.60443 > 10.1.1.82.1074: S 1715577781:1715577781 (0) ack 3309127023 win 5808
    6: 14:08:42.120568 10.1.1.82.1074 > 76.196.10.57.60443:. ACK 1715577782 win 64240
    7: 14:08:42.121102 10.1.1.82.1074 > 76.196.10.57.60443: P 3309127023:3309127147 (124) ack 1715577782 win 64240
    8: 14:08:42.183553 76.196.10.57.60443 > 10.1.1.82.1074:. ACK 3309127147 win 5808
    9: 14:08:42.232867 76.196.10.57.60443 > 10.1.1.82.1074: P 1715577782:1715578445 (663) ack 3309127147 win 5808
    10: 14:08:42.405145 10.1.1.82.1074 > 76.196.10.57.60443:. ACK 1715578445 win 63577
    11: 14:08:43.791340 10.1.1.82.1074 > 76.196.10.57.60443: P 3309127147:3309127345 (198) ack 1715578445 win 63577
    12: 14:08:43.850450 76.196.10.57.60443 > 10.1.1.82.1074:. ACK 3309127345 win 6432

    13: 14:08:44.028196 76.196.10.57.60443 > 10.1.1.82.1074: P 1715578445:1715578504 (59) ack 3309127345 win 6432
    14: 14:08:44.058544 10.1.1.82.1074 > 76.196.10.57.60443: P 3309127345:3309127643 (298) ack 1715578504 win 63518
    15: 14:08:44.116403 76.196.10.57.60443 > 10.1.1.82.1074:. ACK 3309127643 win 7504
    16: 14:08:47.384654 76.196.10.57.60443 > 10.1.1.82.1074: P 1715578504:1715578882 (378) ack 3309127643 win 7504
    17: 14:08:47.385417 76.196.10.57.60443 > 10.1.1.82.1074: 1715578882:1715578882 F (0) ack 3309127643 win 7504
    18: 14:08:47.394068 10.1.1.82.1074 > 76.196.10.57.60443:. ACK 1715578883 win 63140
    19: 14:08:47.394922 10.1.1.82.1074 > 76.196.10.57.60443: P 3309127643:3309127680 (37) ack 1715578883 win 63140
    20: 14:08:47.395151 10.1.1.82.1074 > 76.196.10.57.60443: 3309127680:3309127680 F (0) ack 1715578883 win 63140
    21: 14:08:47.457633 76.196.10.57.60443 > 10.1.1.82.1074: R 1715578883:1715578883 (0) win 0
    22: 14:08:57.258073 10.1.1.82.500 > 76.196.10.57.500: udp 276
    23: 14:08:57.336255 76.196.10.57.500 > 10.1.1.82.500: udp 40
    24: 14:08:58.334211 10.1.1.82.500 > 76.196.10.57.500: udp 276
    25: 14:08:58.412850 76.196.10.57.500 > 10.1.1.82.500: udp 40
    26: 14:09:00.333311 10.1.1.82.500 > 76.196.10.57.500: udp 276
    27: 14:09:00.410730 76.196.10.57.500 > 10.1.1.82.500: udp 40
    28: 14:09:02.412561 10.1.1.82.1075 > 76.196.10.57.443: S 968016865:968016865 (0) win 64240
    29: 14:09:04.349164 10.1.1.82.500 > 76.196.10.57.500: udp 276
    30: 14:09:04.431648 76.196.10.57.500 > 10.1.1.82.500: udp 40
    31: 14:09:05.442710 10.1.1.82.1075 > 76.196.10.57.443: S 968016865:968016865 (0) win 64240
    32: 14:09:11.380427 10.1.1.82.1075 > 76.196.10.57.443: S 968016865:968016865 (0) win 64240
    33: 14:09:12.349926 10.1.1.82.500 > 76.196.10.57.500: udp 276
    34: 14:09:12.421502 10.1.1.82.1076 > 76.196.10.57.60443: S 3856215672:3856215672 (0) win 64240
    35: 14:09:12.430794 76.196.10.57.500 > 10.1.1.82.500: udp 40
    36: 14:09:12.481832 76.196.10.57.60443 > 10.1.1.82.1076: S 248909856:248909856 (0) ack 3856215673 win 5808
    37: 14:09:12.527972 10.1.1.82.1076 > 76.196.10.57.60443:. ACK 248909857 win 64240
    38: 14:09:12.529238 10.1.1.82.1076 > 76.196.10.57.60443: P 3856215673:3856215797 (124) ack 248909857 win 64240
    39: 14:09:12.608275 76.196.10.57.60443 > 10.1.1.82.1076:. ACK 3856215797 win 5808
    40: 14:09:12.658581 76.196.10.57.60443 > 10.1.1.82.1076: P 248909857:248910520 (663) ack 3856215797 win 5808
    41: 14:09:12.664531 10.1.1.82.1076 > 76.196.10.57.60443: P 3856215797:3856215995 (198) ack 248910520 win 63577
    42: 14:09:12.725533 76.196.10.57.60443 > 10.1.1.82.1076:. ACK 3856215995 win 6432
    43: 14:09:12.880813 76.196.10.57.60443 > 10.1.1.82.1076: P 248910520:248910579 (59) ack 3856215995 win 6432
    44: 14:09:12.892272 10.1.1.82.1076 > 76.196.10.57.60443: P 3856215995:3856216293 (298) ack 248910579 win 63518
    45: 14:09:12.953029 76.196.10.57.60443 > 10.1.1.82.1076:. ACK 3856216293 win 7504
    46: 14:09:12.955043 76.196.10.57.60443 > 10.1.1.82.1076: 248910579:248910579 F (0) ack 3856216293 win 7504
    47: 14:09:12.955242 10.1.1.82.1076 > 76.196.10.57.60443:. ACK 248910580 win 63518
    48: 14:09:12.955516 10.1.1.82.1076 > 76.196.10.57.60443: P 3856216293:3856216330 (37) ack 248910580 win 63518
    49: 14:09:12.955730 10.1.1.82.1076 > 76.196.10.57.60443: 3856216330:3856216330 F (0) ack 248910580 win 63518
    50: 14:09:13.019743 76.196.10.57.60443 > 10.1.1.82.1076: R 248910580:248910580 (0) win 0
    51: 14:09:16.068691 10.1.1.82.500 > 76.196.10.57.500: udp 56
    52: 14:09:16.227588 10.1.1.82.1077 > 76.196.10.57.60443: S 3657181617:3657181617 (0) win 64240
    53: 14:09:16.283783 76.196.10.57.60443 > 10.1.1.82.1077: S 908773751:908773751 (0) ack 3657181618 win 5808
    54: 14:09:16.306823 10.1.1.82.1077 > 76.196.10.57.60443:. ACK 908773752 win 64240
    55: 14:09:16.307692 10.1.1.82.1077 > 76.196.10.57.60443: P 3657181618:3657181742 (124) ack 908773752 win 64240
    56: 14:09:16.370998 76.196.10.57.60443 > 10.1.1.82.1077:. ACK 3657181742 win 5808
    57: 14:09:16.411935 76.196.10.57.60443 > 10.1.1.82.1077: P 908773752:908774415 (663) ack 3657181742 win 5808
    58: 14:09:16.417870 10.1.1.82.1077 > 76.196.10.57.60443: P 3657181742:3657181940 (198) ack 908774415 win 63577
    59: 14:09:16.509388 76.196.10.57.60443 > 10.1.1.82.1077:. ACK 3657181940 win 6432

    60: 14:09:16.708413 76.196.10.57.60443 > 10.1.1.82.1077: P 908774415:908774474 (59) ack 3657181940 win 6432
    61: 14:09:16.887100 10.1.1.82.1077 > 76.196.10.57.60443: P 3657181940:3657182254 (314) ack 908774474 win 63518
    62: 14:09:16.948193 76.196.10.57.60443 > 10.1.1.82.1077:. ACK 3657182254 win 7504
    63: 14:09:19.698465 76.196.10.57.60443 > 10.1.1.82.1077: P 908774474:908774740 (266) ack 3657182254 win 7504
    64: 14:09:19.699426 76.196.10.57.60443 > 10.1.1.82.1077: 908774740:908774740 F (0) ack 3657182254 win 7504
    65: 14:09:20.060162 10.1.1.82.1077 > 76.196.10.57.60443:. ACK 908774741 win 63252
    66: 14:09:20.062191 76.196.10.57.60443 > 10.1.1.82.1077: P 908774474:908774740 (266) ack 3657182254 win 7504
    67: 14:09:20.063732 10.1.1.82.1077 > 76.196.10.57.60443:. ACK 908774741 win 63252
    68: 14:09:20.063900 10.1.1.82.1077 > 76.196.10.57.60443: P 3657182254:3657182291 (37) ack 908774741 win 63252
    69: 14:09:20.064098 10.1.1.82.1077 > 76.196.10.57.60443: 3657182291:3657182291 F (0) ack 908774741 win 63252
    70: 14:09:20.127694 76.196.10.57.60443 > 10.1.1.82.1077: R 908774741:908774741 (0) win 0
    70 packages shown

    We had this problem of connection VPN IPsec from the years (I first thought it is restriction access problem, but it does not work or if I disable all access lists, experience of yesterday for the same restriction of the access-list shows longer than PC is not the cause). All suggestions and tips are greatly appreciated.

    Sean

    Hi Sean, please remove th lines highlighted in your pix and try and let me know, that these lines are not the default configuration of the PIX.

    VPN-udp-class of the class-map

    corresponds to the list of access vpn-udp-acl

    vpn-udp-policy policy-map

    VPN-udp-class

    inspect the amp-ipsec

    type of policy-card inspect dns migrated_dns_map_1

    parameters

    message-length maximum 768

    Policy-map global_policy

    class inspection_default

    inspect the migrated_dns_map_1 dns

    inspect the ftp

    inspect h323 h225

    inspect the h323 ras

    inspect the http

    inspect the netbios

    inspect the rsh

    inspect the rtsp

    inspect the skinny

    inspect sqlnet

    inspect sunrpc

    inspect the tftp

    inspect the sip

    inspect xdmcp

    inspect the pptp

    inspect the amp-ipsec

    permit same-security-traffic inter-interface

    permit same-security-traffic intra-interface

    IP verify reverse path to the outside interface

    Thank you

    Rizwan James

  • Cannot use Internet on the VPN connection

    Hello

    I used a cisco customer version 4.0.3 installed on my laptop to connect to the VPN server.

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    When my client is connected to the VPN server over the network domestic Wi - Fi home that has only a single default gateway, 192.168.0.1. I have no problem with the use of the Internet. How can you explain this bizarre situation? I really want to use Internet through a wired network and wireless at the other site office who have only one gateway respectively. Could you explain that?

    Thank you very much... Jae

    You are welcome, I hope we can fix it all.

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