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US Dept of Defense integrated into L2TP VPN?

SalishSwede
My carrier, Sprint is using legacy DoD addresses for cell phone connections but there appears to be something wrong with the VPN functionality... see posts later in this thread.

I'm connecting my smartphone to my local home net using L2TP via the Sophos UTM.

I'm reviewing the firewall logs and notice traffic on port 443 being blocked between two addresses:  
Source:

21.194.27.36  Dept of Defense

Dest:

50.115.125.93   [URL="http://mxtoolbox.com/SuperTool.aspx?action=ptr%3a50.115.125.93&run=toolpage#"]50.115.125.93.static.westdc.net  ??
[/URL]

              69.171.245.49   Facebook

Here's what I can find on the source:
[SIZE=2]Location[/SIZE]                     [SIZE=2]  UNITED STATES, OHIO, COLUMBUS[/SIZE]                                                       [SIZE=2]Latitude, Longitude[/SIZE]                     [SIZE=2]39.96638, -83.01277 (39°57'59"S   -83°0'46"E)[/SIZE]                                                       [SIZE=2]Connection through[/SIZE]                     [SIZE=2]DOD NETWORK INFORMATION CENTER[/SIZE]                                                       [SIZE=2]Local Time[/SIZE]                     [SIZE=2]04 Dec, 2013 05:17 PM (UTC -05:00)[/SIZE]                                                       [SIZE=2]Domain[/SIZE]                     [SIZE=2]NIC.MIL[/SIZE]
Here are a couple of lines from the logs:

[FONT=monospace]14:08:16 Packet filter rule #6 L2TP 21.194.27.36 : 39669 → 50.115.125.93 : 443 [RST] len=40 ttl=63 tos=0x00 srcmac=0:0:2f[:D]2:32:f7
[/FONT]
[FONT=monospace]14:08:19 Packet filter rule #6 L2TP 21.194.27.36 : 39669 → 50.115.125.93 : 443 [RST] len=40 ttl=63 tos=0x00 srcmac=0:0:2f[:D]2:32:f7
[/FONT]
[FONT=monospace]14:08:19 Packet filter rule #6 L2TP 21.194.27.36 : 38247 → 69.171.245.49 : 443 [ACK PSH] len=130 ttl=63 tos=0x00 srcmac=0:0:2f[:D]2:32:f7
[/FONT]
[FONT=monospace]14:08:26 Packet filter rule #6 L2TP 21.194.27.36 : 39669 → 50.115.125.93 : 443 [RST] len=40 ttl=63 tos=0x00 srcmac=0:0:2f[:D]2:32:f7
[/FONT]
 
Note the L2TP is the traffic being parsed. 

Could I get some fresh eyes on this?

Thanks,

Doug


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  • 0
    Hi,

    On the traceroute, I was asking if you could try a traceroute to the DOD address to see if it's going out your internet connection (as it should), or through the VPN to the phone (which would be weird but would at least make some sense based upon the logs).

    On the MAC address: MACs are ALWAYS LOCAL.
    That is why I asked what that address is.

    re the log... all the packets are RST or ACK PSH.
    If you're blocking all traffic from the DoD addresses, then these don't make a lot of sense by themselves.
    Are you using the UTM's HTTPS proxy on your VPN client (phone)?

    All of this is weird, but imho it's early to be jumping to conclusions.

    Barry
Reply
  • 0
    Hi,

    On the traceroute, I was asking if you could try a traceroute to the DOD address to see if it's going out your internet connection (as it should), or through the VPN to the phone (which would be weird but would at least make some sense based upon the logs).

    On the MAC address: MACs are ALWAYS LOCAL.
    That is why I asked what that address is.

    re the log... all the packets are RST or ACK PSH.
    If you're blocking all traffic from the DoD addresses, then these don't make a lot of sense by themselves.
    Are you using the UTM's HTTPS proxy on your VPN client (phone)?

    All of this is weird, but imho it's early to be jumping to conclusions.

    Barry
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