[mythtv-users] Slow Myth with DNS problems

Lee McLaren lmclaren at lrm.com.au
Wed Aug 29 10:11:01 UTC 2007

Tom Dexter wrote:
>> From: "Joe Ripley"
>> On 8/28/07, Lee McLaren <lmclaren at lrm.com.au> wrote:
>>> I also note that it is slower to log onto the backend via ssh if DNS is
>>> not working, say a 30 second wait before the username prompt.
>>> Any ideas?
>> I'm not exactly sure how MythTV handles DNS lookups, but I can
>> understand why SSH takes so long when your name resolution is down.
>> Most SSH servers are configured to reverse-lookup the clients that
>> connect to them for logging purposes.  If DNS is down, this process
>> will have to timeout before you receive the login prompt...
>> Perhaps Myth is attempting to do reverse-lookups as well?
> It could possibly be mysql attempting a reverse look-up as well I suppose.
> In any case, if somethings trying to do so, it may well be that, when the 
> Internet DNS is working, it's simply failing the look-up of the LAN address 
> immediately, but when the Internet/DNS is down, it's taking a long time to 
> timeout.
> I'd try adding all you LAN host names and ip addresses to /etc/hosts on the 
> myth boxes.
> Tom
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Thanks Tom, that seems like a good idea, I have made the changes and
will do some testing.


Lee McLaren
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