[Openswan Users] Certain packets not traversing the VPN

Mike A. Leonetti mleonetti at evolutionce.com
Sat Apr 10 16:13:46 EDT 2010

Mike A. Leonetti
As warm as green tea

Paul Wouters wrote:
> On Sat, 10 Apr 2010, Mike A. Leonetti wrote:
>> On a Linux<->Linux VPN all machines can talk to each other through ping,
>> SSH, RDP, and those protocols work. But port 445 is showed as
>> "filtered" by nmap who also complains and says "Note: Host seems down.
>> If it is really up, but blocking our ping probes, try -PN". What might
>> specifically be blocking this port on machines on either side of the
>> VPN?
>> On both iptables on the VPN all traffic from the source network is
>> Accepted.
> Nothing in the vpn does any of that. You'll have to look elsewhere.
> The only possible issue is MTU. Do an ssh over the tunnel and type
> something like 'ls -al /usr/bin'. It that hangs, you have an mtu
> issue. If
> it works, you do not.
Strangely it doesn't hang. Are there any other tests for that?

>> Essentially the SMB shares aren't working.
> It's been a long time since I was involved in windows shares. There used
> to be a requirement for WINS everywhere when you wanted to do cross
> subnet
> browsing, but I'm not sure if that is still the case.
Yeah. After doing a lot of research on google I've come up with mixed
discussions, results, and a whole lot of nothing. Kinda hitting a wall
here :D.

> Paul

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