[Openswan Users] Site-to-site VPN with openswan
Jakub Sobczak
sopel1000 at gmail.com
Wed Aug 29 04:45:46 EDT 2012
Hi,
tcpdump shows:
10:37:17.007960 IP remote-ip.500 > my-ip.500 : isakmp: phase 1 I ident
> 10:37:17.008104 IP my-ip.500 > remote-ip.500 : isakmp: phase 1 R inf
I do not know where this .500 comes from, it looks like this: 1.2.3.4.500,
but anyway it seems fine. What worries me however is:
104 "conn" #1806: STATE_MAIN_I1: initiate
> 003 "conn" #1806: received Vendor ID payload [Dead Peer Detection]
> 003 "conn" #1806: ignoring unknown Vendor ID payload
> [699369228741c6d4ca094c93e242c9de19e7b7c60000000500000500]
> 003 "conn" #1806: Can't authenticate: no preshared key found for `my-ip'
> and `remote-ip'. Attribute OAKLEY_AUTHENTICATION_METHOD
> 003 "conn" #1806: no acceptable Oakley Transform
> 214 "conn" #1806: STATE_MAIN_I1: NO_PROPOSAL_CHOSEN
Again, my ipsec.secrets looks like this (copy-paste):
my-ip remote-ip : PSK "some-presharedkey"
What is going on? Maybe I have to install something?
Regards,
Jakub
2012/8/29 Roel van Meer <roel.vanmeer at bokxing.nl>
> Jakub Sobczak writes:
>
> Yes, the shared key line is formatted in the following way: 1.2.3.4 <URL:
>> http://5.6.7.8/>5**.6.7.8 <http://5.6.7.8>: PSK "sharedkey" .
>> I changed auto=add to auto=start hoping it would help, but it didn't:
>>
>> ipsec auto --up conn
>> 104 "conn" #1616: STATE_MAIN_I1: initiate
>> 010 "conn" #1616: STATE_MAIN_I1: retransmission; will wait 20s for
>> response
>> 010 "conn" #1616: STATE_MAIN_I1: retransmission; will wait 40s for
>> response
>> 031 "conn" #1616: max number of retransmissions (2) reached
>> STATE_MAIN_I1. No response (or no acceptable response) to our first
>> IKE message
>>
>
> The other side is not responding. Your firewall might not be set up
> correctly. Can you see anything in the logs that indicate the other side is
> trying to make a connection? If not, you could try to see if there is
> traffic coming in from the other side.
>
> With a command like
> tcpdump -nli eth0 host 1.2.3.4
> (assuming eth0 is the network device of your internet connection, and
> replacing 1.2.3.4 by the ip address of the remote endpoint) you can see
> what is happening on the wire.
> Can you try to start the connection while running the tcpdump command and
> post its output?
>
>
> I'm not sure if that's correct: ike=aes256-sha1-**modp1536, but if they
>> say: Key Exchange Encryption: AES256 Data integrity: SHA1 and DH group 5,
>> do you think this line is not correct (ike=aes256-sha1-modp1536)? I cannot
>> influence that, I have to adjust...
>> I am using: Linux Openswan U2.6.23/K2.6.32-31-server (netkey) Maybe the
>> problem is that I am not using certificates but psk?
>>
>
> The config details say the you need to use a shared key, so I assume the
> problem is not related to certificates.
>
>
> How do I check if I can use klips (which I believe I should use instead
>> of netkey).
>>
>
> You are already using klips, since you have this in your config:
> protostack=klips
>
> Regards,
>
> Roel
>
>
>
>>
>>
>> Kind regards,
>> Jakub
>>
>>
>>
>> 2012/8/29 Roel van Meer <<URL:mailto:roel.vanmeer@**bokxing.nl<roel.vanmeer at bokxing.nl>
>> >roel.vanmeer@**bokxing.nl <roel.vanmeer at bokxing.nl>>
>>
>>
>> Jakub Sobczak writes:
>> I have never setup a live openSwan VPN tunnel, so please be
>> understanding =)
>> I received the following config details to establish connection to
>> the other
>> company's gateway:
>> Key Exchange Encryption: AES256 Data integrity: SHA1
>> IKE SA renegotiation: 8 hrs Aggresive mode: No
>> Use DH group: 1536 (group 5)
>> Authentication: PSK
>> IKE phase 2
>> Data Encryption: AES256 Data integrity: SHA1
>> IPSec SA renegotiation: 1 hr Aggresive mode: No
>> Perfect forward secrecy: Yes
>> Use DH group (Perfect forward secrecy) : 1536 (group 5)
>> This is my config from ipsec.conf (below). Apart from
>> that, I also have
>> ipsec.secret with the following content: left_IP(mine)
>> right_IP(othercompany) "PSK"
>> Just to be sure, the format of this needs to be:
>> 1.2.3.4 <URL:http://5.6.7.8>5.6.7.8: PSK "sharedkey"
>> config setup
>> nat_traversal=yes
>> virtual_private=%v4:<URL:http:**
>> //10.0.0.0/8,%v4:192.168.0.0/**16,%v4:172. 16.0.0/12>
>> 10.0.0.0/8,%v4:192.**168.0.0/16,%v4:172.16.0.0/12
>>
>> oe=off
>> protostack=klips
>> conn abc
>> #General
>> keyingtries=1
>> auto=add
>> If you specify "auto=add" the other end will have to initiate the
>> connection. Can you post the logs that show what happens during this
>> time?
>> #IKE Params
>> authby=secret
>> keyexchange=ike
>> This parameter does not occur in my manpage. Which version of
>> openswan are you using?
>> ikelifetime=8h
>> ike=aes256-sha1-modp1536
>> #IPSec Params
>> type=tunnel
>> auth=esp
>> pfs=yes
>> compress=no
>> keylife=60m
>> esp=aes256-sha1
>> #pfsgroup=modp1536
>> # Left security gateway, subnet behind it, nexthop toward
>> right.
>> left=my_IP
>> leftsubnet=<URL:http://192.**168.5.1/32<http://192.168.5.1/32>
>> >192.168.5.1/32 right=other_comp_IP
>>
>> rightsubnet=some_subnet
>> As far as I can see, this is all correct.
>> A general remark: in my experience it is often easier to begin with
>> less specific configuration, for example:
>> ike=aes
>> instead of
>> ike=aes256-sha1-modp1536
>> The second phase does not seem to be established. What is
>> wrong? I believe
>> something with pfsgroup? How to properly set DH group?
>> Best regards,
>> Roel
>>
>>
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