Re: sendmail causing high load
My isp blocks traffic on port 25. So i decided to experiment on adding a listening port for sendmail. While not an answer to your load problem, I suggest you read up on the Submission service (RFC 4409). --lyndon
Re: sendmail causing high load
On Fri, Jun 02, 2006 at 02:32:26PM +0200, Jasper Bal wrote: > Jasper Bal schreef: > >Hi all, > > > >My isp blocks traffic on port 25. So i decided to experiment on adding > >a listening port for sendmail. I added port 53, because this is never > >blocked. I added the following line in sendmail.cf: OOPort=53. I > >killed -1 sendmail. And then all my connections timed out. Ping gives > >a 80% loss. Are there that many wild dns requests? The box doesn't run > >his own dns-server, nor is it registered as one. I'm running OpenBSD > >3.7 on this one. Any thoughts? > After my colocator fixed the switch, I was able to watch statistics on > data traffic. There was minimal traffic, so no DOS attack ;-) > > Requested a reboot and everything was fine again. Port 53 didn't work > properly so i used 26 instead. Now it works fine. Probably a dangling > bit somewhere. > > Kind regards, > Jasper > Why not use the standard port of 587? - David
Re: sendmail causing high load
Jasper Bal schreef: Hi all, My isp blocks traffic on port 25. So i decided to experiment on adding a listening port for sendmail. I added port 53, because this is never blocked. I added the following line in sendmail.cf: OOPort=53. I killed -1 sendmail. And then all my connections timed out. Ping gives a 80% loss. Are there that many wild dns requests? The box doesn't run his own dns-server, nor is it registered as one. I'm running OpenBSD 3.7 on this one. Any thoughts? After my colocator fixed the switch, I was able to watch statistics on data traffic. There was minimal traffic, so no DOS attack ;-) Requested a reboot and everything was fine again. Port 53 didn't work properly so i used 26 instead. Now it works fine. Probably a dangling bit somewhere. Kind regards, Jasper
sendmail causing high load
Hi all, My isp blocks traffic on port 25. So i decided to experiment on adding a listening port for sendmail. I added port 53, because this is never blocked. I added the following line in sendmail.cf: OOPort=53. I killed -1 sendmail. And then all my connections timed out. Ping gives a 80% loss. Are there that many wild dns requests? The box doesn't run his own dns-server, nor is it registered as one. I'm running OpenBSD 3.7 on this one. Any thoughts? Kind regards, Jasper
