[Firewall] Fwd: Issues debugging production ESP tunnels (used for prototype in Astlinux distro)

Arno van Amersfoort arnova at rocky.eld.leidenuniv.nl
Sat Jan 10 17:57:48 CET 2009


Strang as in drop packets.... If the cause is the firewall, you should 
see drop packets (with the default config = log all dropped packets)....

a.

Philip A. Prindeville wrote:
> Define "strange"... :-)
> 
> I'm seeing the tunnel coming up... and I'm seeing "racoon" logs in 
> /var/log/messages telling me that IKE negotiation took place...
> 
> But I'm also seeing the counters for UDP dpt:500 on EXT_INPUT_CHAIN 
> staying zero!!!!!
> 
> -Philip
> 
> 
> Arno van Amersfoort wrote:
>> Are you seeing strange things going on in your firewall logs?
>>
>> a.
>>
>> Philip A. Prindeville wrote:
>>> Normally I wouldn't cross post, but I'm thinking this might be more 
>>> of a firewall issue, since we've otherwise not changed anything in 
>>> terms of the ipsec tools themselves.
>>>
>>> -Philip
>>>
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>> Subject:
>>> Issues debugging production ESP tunnels (used for prototype in 
>>> Astlinux distro)
>>> From:
>>> "Philip A. Prindeville" <philipp_subx at redfish-solutions.com>
>>> Date:
>>> Sun, 04 Jan 2009 17:02:24 -0800
>>> To:
>>> ipsec-tools-users at lists.sourceforge.net
>>>
>>> To:
>>> ipsec-tools-users at lists.sourceforge.net
>>>
>>>
>>> I have two boxes running Astlinux (2.6.26.8 kernel + ipsec-tools 
>>> 0.7.1) in SEA and BOI.
>>>
>>> I've configured them as below.
>>>
>>> I'm also running Arno's Iptables firewall 1.9.0-rc5 at one, and 
>>> 1.8.8o at another.
>>>
>>> I have RP_FILTER disabled, and my IPSEC_VPN_NETS and 
>>> IPSEC_ALLOWED_HOSTS are taken from the values below 
>>> (IPSEC_ALLOWED_HOSTS is set to the SA's remote address, and the 
>>> values of IPSEC_VPN_NETS is set to networks being imported). 
>>> TRUSTED_IF is unset.
>>>
>>> If I do a ping from BOI (B.B.B.B as the public address) to SEA 
>>> (S.S.S.S), I just get:
>>>
>>> pbx ~ # ping -c 3 192.168.10.1
>>> PING 192.168.10.1 (192.168.10.1): 56 data bytes
>>>
>>> --- 192.168.10.1 ping statistics ---
>>> 3 packets transmitted, 0 packets received, 100% packet loss
>>> pbx ~ #
>>>
>>> If I do a traceroute, I get:
>>>
>>> pbx ~ # traceroute 192.168.10.3
>>> traceroute to 192.168.10.3 (192.168.10.3), 30 hops max, 38 byte packets
>>> 1 pbx.redfish-solutions.com (B.B.B.B) 3016.665 ms !H 3020.890 ms !H 
>>> 3021.120 ms !H
>>> pbx ~ #
>>>
>>>
>>> I don't have tcpdump compiled with crypto because of some issues with 
>>> the autoconf script not handling cross-compilation properly.
>>>
>>> I'm trying to figure out what is going wrong, because we want to 
>>> debug the configuration, then automate it as "boilerplate" in the 
>>> distro.
>>>
>>> We did have it working reliably for a while, but it stopped working 
>>> following some changes made to the Firewall shim code, and we've not 
>>> been able to isolate which change caused the issue.
>>>
>>> Can someone help me through the troubleshooting steps so we can 
>>> figure out what is happening to the traffic?
>>>
>>> Thanks,
>>>
>>> -Philip
>>>
>>> ========
>>> SEA
>>>
>>> pbx / # setkey -D
>>> B.B.B.B S.S.S.S esp mode=tunnel spi=128695538(0x07abbcf2) 
>>> reqid=0(0x00000000)
>>> E: 3des-cbc a4f91f54 2b2720e4 3fbc1c7c 5c9fa83d c2be21f9 41bf3554
>>> A: hmac-md5 6aa5548c ced96b86 ef944341 947eb9bb
>>> seq=0x00000000 replay=4 flags=0x00000000 state=mature created: Jan 4 
>>> 16:04:54 2009 current: Jan 4 16:44:12 2009
>>> diff: 2358(s) hard: 3600(s) soft: 2880(s)
>>> last: hard: 0(s) soft: 0(s)
>>> current: 0(bytes) hard: 0(bytes) soft: 0(bytes)
>>> allocated: 0 hard: 0 soft: 0
>>> sadb_seq=1 pid=3560 refcnt=0
>>> S.S.S.S B.B.B.B esp mode=tunnel spi=129039947(0x07b0fe4b) 
>>> reqid=0(0x00000000)
>>> E: 3des-cbc 1721a852 16f878a8 961a46a8 7340b573 f3023228 323c7b84
>>> A: hmac-md5 5d004e83 102fcdd4 48342691 77048ae4
>>> seq=0x00000000 replay=4 flags=0x00000000 state=mature created: Jan 4 
>>> 16:04:54 2009 current: Jan 4 16:44:12 2009
>>> diff: 2358(s) hard: 3600(s) soft: 2880(s)
>>> last: hard: 0(s) soft: 0(s)
>>> current: 0(bytes) hard: 0(bytes) soft: 0(bytes)
>>> allocated: 0 hard: 0 soft: 0
>>> sadb_seq=0 pid=3560 refcnt=0
>>> pbx / # setkey -D -P
>>> 192.168.10.0/24[any] 192.168.1.0/24[any] any
>>> out ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 00:52:42 2009 lastused: Jan 4 16:44:10 2009
>>> lifetime: 0(s) validtime: 0(s)
>>> spid=97 seq=1 pid=3561
>>> refcnt=4
>>> 192.168.1.0/24[any] 192.168.10.0/24[any] any
>>> in ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 00:52:42 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=104 seq=2 pid=3561
>>> refcnt=1
>>> 192.168.1.0/24[any] 192.168.10.0/24[any] any
>>> fwd ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 00:52:42 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=114 seq=3 pid=3561
>>> refcnt=1
>>> 192.168.10.0/24[any] 192.168.3.0/24[any] any
>>> out ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 00:52:42 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=121 seq=4 pid=3561
>>> refcnt=1
>>> 192.168.3.0/24[any] 192.168.10.0/24[any] any
>>> in ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 00:52:42 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=128 seq=5 pid=3561
>>> refcnt=1
>>> 192.168.3.0/24[any] 192.168.10.0/24[any] any
>>> fwd ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 00:52:42 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=138 seq=0 pid=3561
>>> refcnt=1
>>> pbx / # pbx / # ifconfig
>>> br1 Link encap:Ethernet HWaddr 00:00:24:C9:30:01 inet 
>>> addr:192.168.10.1 Bcast:192.168.10.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:1020592 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:1305930 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:185270345 (176.6 MiB) TX 
>>> bytes:1462210420 (1.3 GiB)
>>>
>>> eth1 Link encap:Ethernet HWaddr 00:00:24:C9:30:01 UP BROADCAST 
>>> MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>> Interrupt:5 Base address:0x4100
>>> eth2 Link encap:Ethernet HWaddr 00:00:24:C9:30:02 UP BROADCAST 
>>> MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>> Interrupt:9 Base address:0x6200
>>> eth3 Link encap:Ethernet HWaddr 00:00:24:C9:30:03 UP BROADCAST 
>>> RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:1020597 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:1305930 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:202156549 (192.7 MiB) TX 
>>> bytes:1462210420 (1.3 GiB)
>>> Interrupt:12 Base address:0x8300
>>> lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0
>>> UP LOOPBACK RUNNING MTU:16436 Metric:1
>>> RX packets:43 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:43 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:5287 (5.1 KiB) TX bytes:5287 (5.1 
>>> KiB)
>>>
>>> ppp0 Link encap:Point-to-Point Protocol inet addr:S.S.S.S 
>>> P-t-P:Q.Q.Q.Q Mask:255.255.255.255
>>> UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
>>> RX packets:1241545 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:888948 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:3 RX bytes:1431360739 (1.3 GiB) TX 
>>> bytes:128776438 (122.8 MiB)
>>>
>>> w1ad Link encap:Ethernet HWaddr 00:77:77:77:82:7B UP BROADCAST 
>>> RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:1268344 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:933447 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:1460282807 (1.3 GiB) TX 
>>> bytes:149208820 (142.2 MiB)
>>> Interrupt:10 Memory:d08e0000-d08e1fff
>>> pbx / # brctl show
>>> bridge name bridge id STP enabled interfaces
>>> br1 8000.000024c93001 no eth1
>>> eth2
>>> eth3
>>> pbx / # netstat -n -r
>>> Kernel IP routing table
>>> Destination Gateway Genmask Flags MSS Window irtt Iface
>>> Q.Q.Q.Q 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
>>> 192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 br1
>>> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br1
>>> 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 br1
>>> 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0 0 br1
>>> 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0
>>> pbx / #
>>>
>>> ========
>>>
>>> BOI
>>>
>>>
>>> pbx ~ # setkey -D
>>> S.S.S.S B.B.B.B esp mode=tunnel spi=129039947(0x07b0fe4b) 
>>> reqid=0(0x00000000)
>>> E: 3des-cbc 1721a852 16f878a8 961a46a8 7340b573 f3023228 323c7b84
>>> A: hmac-md5 5d004e83 102fcdd4 48342691 77048ae4
>>> seq=0x00000000 replay=4 flags=0x00000000 state=mature created: Jan 4 
>>> 17:04:54 2009 current: Jan 4 17:46:26 2009
>>> diff: 2492(s) hard: 3600(s) soft: 2880(s)
>>> last: hard: 0(s) soft: 0(s)
>>> current: 0(bytes) hard: 0(bytes) soft: 0(bytes)
>>> allocated: 0 hard: 0 soft: 0
>>> sadb_seq=1 pid=14998 refcnt=0
>>> B.B.B.B S.S.S.S esp mode=tunnel spi=128695538(0x07abbcf2) 
>>> reqid=0(0x00000000)
>>> E: 3des-cbc a4f91f54 2b2720e4 3fbc1c7c 5c9fa83d c2be21f9 41bf3554
>>> A: hmac-md5 6aa5548c ced96b86 ef944341 947eb9bb
>>> seq=0x00000000 replay=4 flags=0x00000000 state=mature created: Jan 4 
>>> 17:04:54 2009 current: Jan 4 17:46:26 2009
>>> diff: 2492(s) hard: 3600(s) soft: 2880(s)
>>> last: hard: 0(s) soft: 0(s)
>>> current: 0(bytes) hard: 0(bytes) soft: 0(bytes)
>>> allocated: 0 hard: 0 soft: 0
>>> sadb_seq=0 pid=14998 refcnt=0
>>> pbx ~ # setkey -D -P
>>> 192.168.1.0/24[any] 192.168.10.0/24[any] any
>>> out ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=129 seq=1 pid=14999
>>> refcnt=1
>>> 192.168.10.0/24[any] 192.168.1.0/24[any] any
>>> in ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=136 seq=2 pid=14999
>>> refcnt=1
>>> 192.168.10.0/24[any] 192.168.1.0/24[any] any
>>> fwd ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=146 seq=3 pid=14999
>>> refcnt=1
>>> 192.168.3.0/24[any] 192.168.10.0/24[any] any
>>> out ipsec
>>> esp/tunnel/B.B.B.B-S.S.S.S/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=153 seq=4 pid=14999
>>> refcnt=1
>>> 192.168.10.0/24[any] 192.168.3.0/24[any] any
>>> in ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=160 seq=5 pid=14999
>>> refcnt=1
>>> 192.168.10.0/24[any] 192.168.3.0/24[any] any
>>> fwd ipsec
>>> esp/tunnel/S.S.S.S-B.B.B.B/require
>>> created: Jan 4 01:52:35 2009 lastused: lifetime: 0(s) validtime: 0(s)
>>> spid=170 seq=0 pid=14999
>>> refcnt=1
>>> pbx ~ # pbx ~ # ifconfig
>>> ap0 Link encap:Ethernet HWaddr 06:02:6F:4B:C7:04 UP BROADCAST RUNNING 
>>> MULTICAST MTU:2290 Metric:1
>>> RX packets:895434 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:2042596 errors:0 dropped:392 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:197271804 (188.1 MiB) TX 
>>> bytes:672388859 (641.2 MiB)
>>>
>>> br0 Link encap:Ethernet HWaddr 00:00:24:C9:28:A4 inet addr:B.B.B.B 
>>> Bcast:66.232.79.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:664688 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:654946 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:366342993 (349.3 MiB) TX 
>>> bytes:178574940 (170.3 MiB)
>>>
>>> br1 Link encap:Ethernet HWaddr 00:00:24:C9:28:A6 inet 
>>> addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:2874901 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:1172387 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:690602050 (658.6 MiB) TX 
>>> bytes:527443783 (503.0 MiB)
>>>
>>> eth0 Link encap:Ethernet HWaddr 00:00:24:C9:28:A4 UP BROADCAST 
>>> RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:664694 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:654946 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:375894394 (358.4 MiB) TX 
>>> bytes:178574940 (170.3 MiB)
>>> Interrupt:11 Base address:0x8000
>>> eth1 Link encap:Ethernet HWaddr 00:00:24:C9:28:A5 UP BROADCAST 
>>> MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>> Interrupt:5 Base address:0x100
>>> eth2 Link encap:Ethernet HWaddr 00:00:24:C9:28:A6 UP BROADCAST 
>>> RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:2708107 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:833087 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:660263684 (629.6 MiB) TX 
>>> bytes:289840990 (276.4 MiB)
>>> Interrupt:9 Base address:0x2200
>>> eth2.1 Link encap:Ethernet HWaddr 00:00:24:C9:28:A6 UP BROADCAST 
>>> RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:2429226 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:833087 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:606022550 (577.9 MiB) TX 
>>> bytes:289840990 (276.4 MiB)
>>>
>>> eth2.3 Link encap:Ethernet HWaddr 00:00:24:C9:28:A6 inet 
>>> addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>>
>>> eth2.4 Link encap:Ethernet HWaddr 00:00:24:C9:28:A6 inet 
>>> addr:192.168.4.1 Bcast:192.168.4.255 Mask:255.255.255.0
>>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>>
>>> eth3 Link encap:Ethernet HWaddr 00:00:24:C9:28:A7 UP BROADCAST 
>>> MULTICAST MTU:1500 Metric:1
>>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
>>> Interrupt:12 Base address:0x4300
>>> lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0
>>> UP LOOPBACK RUNNING MTU:16436 Metric:1
>>> RX packets:2560 errors:0 dropped:0 overruns:0 frame:0
>>> TX packets:2560 errors:0 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:0 RX bytes:286696 (279.9 KiB) TX bytes:286696 
>>> (279.9 KiB)
>>>
>>> wifi0 Link encap:UNSPEC HWaddr 
>>> 00-02-6F-4B-C7-04-00-00-00-00-00-00-00-00-00-00 UP BROADCAST RUNNING 
>>> MULTICAST MTU:1500 Metric:1
>>> RX packets:1365326 errors:0 dropped:0 overruns:0 frame:145607
>>> TX packets:2085706 errors:5061 dropped:0 overruns:0 carrier:0
>>> collisions:0 txqueuelen:280 RX bytes:199630566 (190.3 MiB) TX 
>>> bytes:756727827 (721.6 MiB)
>>> Interrupt:15
>>> pbx ~ # brctl show
>>> bridge name bridge id STP enabled interfaces
>>> br0 8000.000024c928a4 no eth0
>>> eth1
>>> br1 8000.000024c928a6 no ap0
>>> eth2.1
>>> eth3
>>> pbx ~ # netstat -n -r
>>> Kernel IP routing table
>>> Destination Gateway Genmask Flags MSS Window irtt Iface
>>> 192.168.4.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2.4
>>> 192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2.3
>>> B.B.B.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
>>> 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br1
>>> 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 br1
>>> 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0 0 eth2.4
>>> 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0 0 eth2.3
>>> 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0 0 br1
>>> 0.0.0.0 B.B.B.1 0.0.0.0 UG 0 0 0 br0
>>> pbx ~ #
>>>
>>>
>>>
>>>
> 
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> 

-- 
Arno van Amersfoort
E-mail    : arnova at rocky.eld.leidenuniv.nl
Donations are welcome through Paypal!
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