Wireshark · Wireshark-users: Re: [Wireshark-users] Help With EPS/ISAKMP

[Martin Visser <martinvisser99@xxxxxxxxx>]

Josue,

Your capture is showing that your client 192.168.15.3 is trying to
initiate key exchange using ISAKMP at 0, 8 and 24 seconds into the
packet capture. Your capture isn't showing any responses, and the
almost integral second intervals of the requests strongly indicate a
client timeout retrying to a non-response

You probably need to verify that your server is listening on UDP port
500 for ISAKMP/IKE  traffic. Note that that UDP port 500 is reserved
for non-NATted traffic, UDP 4500 for NAT traversal.

Unless your server responds there is not much further to say. (Your
server to debug or other logging configured on to see the incoming IKE
attempt)

Regards, Martin

MartinVisser99@xxxxxxxxx



On Fri, Jun 19, 2009 at 12:15 AM, Josue Del
Valle<jodelvalle@xxxxxxxxxxxxxxx> wrote:
> This is what's getting logged on the firewall:
>
> 6|Jun 18 2009|05:50:16|302015|WebServer|500|AppServer|500|Built inbound UDP connection 34986 for dmz1:WebServer/500 (WebServer/500) to inside:AppServer/500 (AppServer/500)
>
> 2|Jun 18 2009|05:50:16|106100|WebServer|500|AppServer|500|access-list dmz_access_in permitted udp dmz1/WebServer(500) -> inside/AppServer(500) hit-cnt 1 first hit [0xba28b9ac, 0x0]
>
> -----Original Message-----
> From: Alex Nedelcu [mailto:alexpheno@xxxxxxxxx]
> Sent: 2009-06-18 4:45 AM
> To: Community support list for Wireshark
> Subject: [SPAM] - Re: [Wireshark-users] Help With EPS/ISAKMP - Email found in subject
>
> Can you attach some packet captures and the relevant logs from the servers?
> As Robert said you shoul also first check if there is some sort of
> firewall dropping ESP (ip protocol 50).
>
> On Wed, Jun 17, 2009 at 11:20 PM, Robert D. Scott<robert@xxxxxxx> wrote:
>> Sound like an ACL or firewall between the DMZ and the other network dropping
>> ESP.
>>
>> Robert D. Scott                 Robert@xxxxxxx
>> Senior Network Engineer         352-273-0113 Phone
>> CNS - Network Services          352-392-2061 CNS Phone Tree
>> University of Florida           352-392-9440 FAX
>> Florida Lambda Rail             352-294-3571 FLR NOC
>> Gainesville, FL  32611          321-663-0421 Cell
>>
>>
>> -----Original Message-----
>> From: wireshark-users-bounces@xxxxxxxxxxxxx
>> [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Josue Del Valle
>> Sent: Wednesday, June 17, 2009 4:16 PM
>> To: wireshark-users@xxxxxxxxxxxxx
>> Subject: [Wireshark-users] Help With EPS/ISAKMP
>>
>> Hi,
>>
>>
>>
>> I was hoping someone could help me with this issue.   I have configured
>> IPSec on two Windows 2003 servers using certificates as the authentication.
>> If I run wireshark from one of the server while having both servers on the
>> same network, I can see a bunch of ESP which indicate to me that the traffic
>> is encrypted between the two servers.  If I move one of the servers to
>> another network (DMZ) and try to communicate with the server located on the
>> trusted network, I can't and instead of getting ESP packets all I see is
>> ISAKMP packets.  I have not change anything on the IPsec except the ip for
>> the server that has been moved to the DMZ.  The trusted network as a
>> 192.168.10.X subnet and the one on the DMZ is 192.168.20.X.
>>
>>
>>
>> If I remove IPSec I can communicate from the DMZ to the LAN as intended
>> which indicate routing on the firewall is working fine.  I know it is kind
>> of confusing, but I'm trying to figure out why WireShark shows ESP packets
>> when the server is on the LAN and ISAKMP packets when the server is moved to
>> the DMZ.
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Josue
>>
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