[strongSwan] local host is behind NAT, sending keep alives

[Stephen Feyrer]

Hey everyone,

I have a laptop tethered via my phone, Ubuntu 18.4.  I am unable to establish a connection and none of my research has thus far revealed anything helpful.  Please review the below and advise.  Other proprietary clients are able to connect without issue.

I have an ipsec.conf file which looks like:

conn officeVPN
        aggressive=yes
        type=tunnel
        authby=secret
        keyexchange=ikev1
        ike=aes128-sha1-modp2048
       esp= aes256-sha256-modp2048
        mobike=no
        left=%defaultroute
        leftsourceip=%config
        modeconfig=push
        leftprotoport=udp/l2tp
        right= 50.45.0.51
        rightprotoport=udp/l2tp
        righted=10.0.0.254
        auto=add
        xauth_identity=user

An ipsec.secrets that looks like:

50.45.0.51 %any : PSK "StrongKey-Honest!"
user %any : XAUTH "password"

An /etc/strongswan.conf that has the following line:

i_dont_care_about_security_and_use_aggressive_mode_psk=yes


Then the ipsec up officeVPN command is run:

$ sudo ipsec up officeVPN
initiating Aggressive Mode IKE_SA officeVPN[1] to 50.54.0.51
generating AGGRESSIVE request 0  [ SA KE No ID V V V V V ]
sending packet:    from 1.0.0.127[500] to 50.54.0.51[500] (548 bytes)
received packet:    from 50.54.0.51[500] to 1.0.0.127[500] (564 bytes)
parsed AGGRESSIVE response 0 [ SA KE No ID HASH V NAT-D NAT-D V V V V V ]
received NAT-T (RFC 3947) vendor ID
received DPD vendor ID
received XAuth vendor ID
received unknown vendor ID: 00:00:00:00:00:00:00:00:00:08:00:00:00:00:00:00
received FRAGMENTATION vendor ID
received FRAGMENTATION vendor ID
local host is behind NAT, sending keep alives
remote host is behind NAT
IKE_SA officeVPN[1] established between 1.0.0.127[1.0.0.127]... 50.54.0.51[10.0.0.254]
scheduling reauthentication in 9761s
maximum IKE_SA lifetime 10301s
generating AGGRESSIVE request 0 [ HASH NAT-D ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (108 bytes)
received packet:    from 50.54.0.51[4500] to 1.0.0.127[4500] (76 bytes)
generating TRANSACTION response 890044400 [ HASH CP ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (76 bytes)
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
received packet:    from 50.54.0.51[500] to 1.0.0.127[500] (92 bytes)
parsed INFORMATIONAL_V1 request 4321098765 [ HASH N(DPD) ]
generating INFORMATIONAL_V1 request 0987654321 [ HASH N(DPD_ACK) ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (92 bytes)
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
received packet:    from 50.54.0.51[500] to 1.0.0.127[500] (92 bytes)
parsed INFORMATIONAL_V1 request 7654321098 [ HASH N(DPD) ]
generating INFORMATIONAL_V1 request 2109876543 [ HASH N(DPD_ACK) ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (92 bytes)
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
received packet:    from 50.54.0.51[500] to 1.0.0.127[500] (92 bytes)
parsed INFORMATIONAL_V1 request 3210987654 [ HASH N(DPD) ]
generating INFORMATIONAL_V1 request 6543210987 [ HASH N(DPD_ACK) ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (92 bytes)
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
sending keep alive to 50.54.0.51[4500]
deleting IKE_SA officeVPN[1] between 1.0.0.127[1.0.0.127]... 50.54.0.51[10.0.0.254]
sending DELETE for IKE_SA officeVPN[1]
parsed INFORMATIONAL_V1 request 5432109876 [ HASH D ]
sending packet:    from 1.0.0.127[4500] to 50.54.0.51[4500] (92 bytes)
establishing connection 'officeVPN' failed

Thank you.


--
Stephen Feyrer
DevOps Engineer
Greensill Capital
stephen.feyrer at greensill.com<mailto:stephen.feyrer at greensill.com>
http://www.greensill.com


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