Re: openvpn - urgent help requested!

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Andrew Parker wrote:


>> Just to follow up on myself - I'm in Italy now,
>> and everything works fine _except_ VPN.
>> I can ssh into my home server, get IMAP email from it,
>> and generally interact with it as I do at home,
>>
>> If I ssh into my home server, ifconfig gives:
>> --------------------------------------------
>> tun0      Link encap:UNSPEC  HWaddr
>> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>>          inet addr:192.168.5.1  P-t-P:192.168.5.2  Mask:255.255.255.255
>>          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>>          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:100
>>          RX bytes:756 (756.0 b)  TX bytes:1008 (1008.0 b)
>> --------------------------------------------
>> while ifconfig on my laptop gives
>> --------------------------------------------
>> tun0      Link encap:UNSPEC  HWaddr
>> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>>          inet addr:192.168.5.6  P-t-P:192.168.5.5  Mask:255.255.255.255
>>          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>>          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:100
>>          RX bytes:336 (336.0 b)  TX bytes:252 (252.0 b)
>> --------------------------------------------
>> As I point out, the P-t-P addresses are different -
>> I don't know if that is significant.

> this is normal. 

> > What do your routes look like?  What are your configs, and how do you
> start openvpn?

My server.conf and client.conf are:
--------------------------------------------
port 1194
proto udp
dev tun
ca /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/server.crt
key /etc/openvpn/keys/server.key  # This file should be kept secret
dh /etc/openvpn/keys/dh1024.pem
server 192.168.5.0 255.255.255.0
ifconfig-pool-persist ipp.txt
keepalive 10 120
comp-lzo
persist-key
persist-tun
status openvpn-status.log
verb 3
--------------------------------------------
dev tun
proto udp
remote www.gayleard.com 1194
resolv-retry infinite
persist-key
persist-tun
ca /etc/openvpn/keys/ca.crt
cert /etc/openvpn/keys/mary.crt
key /etc/openvpn/keys/mary.key
ns-cert-type server
comp-lzo
verb 3
--------------------------------------------

"route -n" on server and client give:
--------------------------------------------
Destination     Gateway         Genmask         Flags Metric Ref    Iface
192.168.5.2     0.0.0.0         255.255.255.255 UH    0      0        0 tun0
192.168.5.0     192.168.5.2     255.255.255.0   UG    0      0        0 tun0
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth1
0.0.0.0         192.168.1.254   0.0.0.0         UG    0      0        0 eth0
--------------------------------------------
Destination     Gateway         Genmask         Flags Metric Ref    Iface
192.168.5.1     192.168.5.5     255.255.255.255 UGH   0      0        0 tun0
192.168.5.5     0.0.0.0         255.255.255.255 UH    0      0        0 tun0
192.168.1.0     0.0.0.0         255.255.255.0   U     2      0        0 eth1
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth1
--------------------------------------------

I start openvpn on both machines with "sudo service openvpn restart".

The server is running Centos-5.3, the client Fedora-10.

I don't see anything in /var/log/messages on either machine
to suggest that anything is wrong.

> do you have a firewall running?

I do have shorewall running on the server.
But I have a rule to allow udp packets in and out through port 1194:
--------------------------------------------
ACCEPT         net             $FW              udp     1194 # OpenVPN
ACCEPT         $FW             net              udp     1194 # OpenVPN
--------------------------------------------

I have a pinhole on my ADSL modem at home allowing these packets through.
As I said earlier, openvpn did work on a previous visit.
That was with a different server, running Fedora-9.
But I'm pretty sure I have not altered the modem.

As always, any and all enlightenment gratefully received.


-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College Dublin 


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