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Re: openvpn - urgent help requested!



On Fri, Apr 10, 2009 at 6:50 AM, Timothy Murphy <gayleard eircom net> wrote:
> Timothy Murphy wrote:
>
>> I'm just about the depart for a week in Italy,
>> and have set up openvpn to communicate from there
>> with my server at home.
>>
>> I notice that ifconfig on the server gives
>>     inet addr:192.168.5.1  P-t-P:192.168.5.2  Mask:255.255.255.255
>> while ifconfig on the client gives
>>   inet addr:192.168.5.6  P-t-P:192.168.5.5  Mask:255.255.255.255
>> with a different P-t-P address.
>>
>> Does this matter?
>> I see from my notes that when I last carried out this exercise
>> the two P-t-P addresses were the same.
>> (Unfortunately that was with a different server no longer with us.)
>>
>> On the previous occasion both server and client were running Fedora.
>> Now the server is running Centos-5.3 and the client Fedora-10.
>>
>> Any enlightenment gratefully received.
>
> 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.  from my setup

server:

tun0      Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:192.168.12.1  P-t-P:192.168.12.2  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:501300 errors:0 dropped:0 overruns:0 frame:0
          TX packets:515238 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:306730588 (292.5 MiB)  TX bytes:91491407 (87.2 MiB)

from remote:

tun0      Link encap:UNSPEC  HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:192.168.12.10  P-t-P:192.168.12.9  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:44869 errors:0 dropped:0 overruns:0 frame:0
          TX packets:40606 errors:0 dropped:2 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:10622523 (10.1 MiB)  TX bytes:20230125 (19.2 MiB)

ping from remote:
$ ping 192.168.12.1
PING 192.168.12.1 (192.168.12.1) 56(84) bytes of data.
64 bytes from 192.168.12.1: icmp_seq=1 ttl=64 time=19.0 ms

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

> Also ping from my laptop gives
> --------------------------------------------
> [tim mary ~]$ ping -c1 192.168.5.1
> PING 192.168.5.1 (192.168.5.1) 56(84) bytes of data.
> >From 192.168.5.1 icmp_seq=1 Destination Host Unreachable
> --------------------------------------------
> I'm not clear why it thinks it is pinging from 192.168.5.1
> and not 192.168.5.6 .

this is 192.168.5.1 replying with "Destination Host Unreachable",
which seems really odd as that is its address.

do you have a firewall running?

is it only ping that is affected?  can you telnet to the ssh server
and see the SSH server respond, for example?   telnet 192.168.5.1 22


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