Topic: UDP triggered dailout

[Kees Vonk]

I have set up my SME server to dailout every six hours, be every so often it seems to dailout by it self, in the messages log I find then something like this:


Jun 27 11:35:43 IMP[2567]: Login 10.1.1.5 to iooffice1.globalnet.co.uk:143 as ioteam
Jun 27 11:35:43 identd[3639]: Successful lookup: 1126 , 143 : www.admin
Jun 27 11:35:43 identd[3640]: Successful lookup: 1125 , 143 : www.admin
Jun 27 11:38:08 diald[829]: Trigger: udp        10.1.1.200/1024    192.203.230.10/53  
Jun 27 11:38:08 diald[829]: Calling site 195.147.208.2
Jun 27 11:38:09 chat[3642]: abort on (BUSY)
Jun 27 11:38:09 chat[3642]: abort on (ERROR)
Jun 27 11:38:09 chat[3642]: abort on (NO CARRIER)
[... etc ...]

I don't know if the first three lines are related, but I thought I supply them anyway. Does anyone know what causes this and how I can stop it?

Kees

[Nathan Fowler]

Yes, this is DNS related (UDP 53).  From what I see, It appears your box is trying to update it's cached DNS settings from the DNS root nameservers.  I would consider this behavior normal; stopping it could produce unwanted effects such as an outdated DNS cache.

Jun 27 11:38:08 diald[829]: Trigger: udp 10.1.1.200/1024 192.203.230.10/53

Name:    E.ROOT-SERVERS.NET
Address:  192.203.230.10

Hope this helped,
Nathan

[Kees Vonk]

OK, if I cannot stop it, would it be possible to sync it with the scheduled dialouts? That way the modem connection is open anyway?

Kees

[Nathan Fowler]

Doubtfully, each zone has a cache expiry period, from what I understand as these cached zones expire the DNS server is contacting the root servers to retrieve updated information.  A "solution" in your case would be to disable the E-Smith dns server, configure E-Smith to use your ISP's DNS server, and configure each client to use your ISP's DNS server.  You would lose the local caching nameserver and some of the other features, but this would prevent your Modem connection.  My question is, why is this such a big deal?  To be quite honest I would leave everything alone unless it's critical that you control the connection times.

Hope this helped,
Nathan

[Kees Vonk]

It is not a big deal to me, but the people I have set this thing up for, really want to minimise the connection time.

There is a DNS server on the lan, that uses a permanent ADSL connection (long story don't ask), so if I could disable the e-smith dns server and just the lan dns server that would be find with me. (All clients use that dns server as well.) I already set that dns server up as the master dns server in the setup menu, but that didn't seem to make any difference.

So can you tell me how to disable the e-smith dns server (and what would the side effects be).

Thank you very much,

Kees