[OpenAFS] Weird client behaviour with openafs 1.4.5

[Jeffrey Altman]

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Berthold Cogel wrote:

>> Is NAT in play?
>> Are callbacks being lost? The 1.2.13 server almost certainly has
>> issues tracking the client port if NAT's in play.
>> The empty modes are just what Linux shows you when there's no
>> fetchstatus data to show.
> 
> No NAT. Most of the internal network security related things are done
> with some dirty ACL magic by our network gurus. If the traffic hits some
> of their rules they're really fast when it comes to hit the bad guys.
> I've asked them, but there was nothing special in the monitoring data.

1.2.x is going to have problems with not only NATs but also with clients
that change their IP addresses, IP addresses that are used by more than
one client, clients that support the TellMeAboutYourself RPC but do not 
generate a UUID, and many other scenarios.

Many VPNs use NAT techniques so if there is a VPN in play then you must
think NAT.

NATs have two characteristics that are bad for AFS.  The first is the 
port mapping.  This is a killer for 1.2.x file servers because those 
file servers assume that all clients are on port 7001 and cannot 
distinguish between two clients on the same IP address with different 
port numbers.

The second problem is the port mapping timeout.  However, this is really 
not a NAT issue but a firewall rule issue.  If your firewall opens the 
firewall for incoming responses based upon an outgoing UDP packet and 
only does so for 30 seconds or so, the AFS callbacks are not going to 
work.  The firewall must leave the inbound port open for at least ten 
minutes.

Jeffrey Altman



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