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From: Doug Hardie on 15 Feb 2010 15:40
Looking through the system I find that sendmail has a number of UDP
ports open that I can't identify: 984, 749, 738, 638, 766, 828, and
966. What are these used for? Only 2 are in the services file and the
names there are not all that descriptive.
From: Man-wai Chang to The Door (24000bps) on 16 Feb 2010 07:56
On 16-Feb-10 20:56, Man-wai Chang to The Door (24000bps) wrote:
> On 16-Feb-10 04:40, Doug Hardie wrote:
>> Looking through the system I find that sendmail has a number of UDP
>> ports open that I can't identify: 984, 749, 738, 638, 766, 828, and
>> 966. What are these used for? Only 2 are in the services file and the
>> names there are not all that descriptive.
>
> You using Linux?
>
> Post output of `netstat -anp | grep sendmail`!
>

Please login as root first!

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.32.8
^ ^ 20:56:01 up 1 day 5:46 0 users load average: 1.27 1.15 1.10
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: Man-wai Chang to The Door (24000bps) on 16 Feb 2010 07:56
On 16-Feb-10 04:40, Doug Hardie wrote:
> Looking through the system I find that sendmail has a number of UDP
> ports open that I can't identify: 984, 749, 738, 638, 766, 828, and
> 966. What are these used for? Only 2 are in the services file and the
> names there are not all that descriptive.

You using Linux?

Post output of `netstat -anp | grep sendmail`!

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.32.8
^ ^ 20:55:01 up 1 day 5:45 0 users load average: 1.44 1.16 1.10
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: Doug Hardie on 20 Feb 2010 03:01
In article <4b7a95eb$0$269$14726298(a)news.sunsite.dk>,
"Man-wai Chang to The Door (24000bps)" <toylet.toylet(a)gmail.com>
wrote:

> On 16-Feb-10 04:40, Doug Hardie wrote:
> > Looking through the system I find that sendmail has a number of UDP
> > ports open that I can't identify: 984, 749, 738, 638, 766, 828, and
> > 966. What are these used for? Only 2 are in the services file and the
> > names there are not all that descriptive.
>
> You using Linux?
>
> Post output of `netstat -anp | grep sendmail`!

Its FreeBSD and those arguments are invalid. However, today none of
those ports are in use. Sendmail has no open udp descriptors on any of my servers.
From: Doug Hardie on 21 Feb 2010 18:13
In article <bc979-7BF087.00014520022010(a)news.lafn.org>,
Doug Hardie <bc979(a)lafn.org> wrote:

> In article <4b7a95eb$0$269$14726298(a)news.sunsite.dk>,
> "Man-wai Chang to The Door (24000bps)" <toylet.toylet(a)gmail.com>
> wrote:
>
> > On 16-Feb-10 04:40, Doug Hardie wrote:
> > > Looking through the system I find that sendmail has a number of UDP
> > > ports open that I can't identify: 984, 749, 738, 638, 766, 828, and
> > > 966. What are these used for? Only 2 are in the services file and the
> > > names there are not all that descriptive.
> >
> > You using Linux?
> >
> > Post output of `netstat -anp | grep sendmail`!
>
> Its FreeBSD and those arguments are invalid. However, today none of
> those ports are in use. Sendmail has no open udp descriptors on any of my
> servers.

I see now why they didn't show before. They are all used when receiving
incoming email. Apparently the last time I checked none was coming in.
Here is a sockstat that shows 615 and 747 in use: (no idea why they
seem to be different ports each time)

root sendmail 57503 3 tcp4 206.117.18.9:48257
209.85.216.28:25
root sendmail 57503 4 dgram -> /var/run/logpriv
root sendmail 57503 5 stream (not connected)
root sendmail 57503 10 udp4 *:615 *:*
root sendmail 57503 12 tcp4 206.117.18.9:48257
209.85.216.28:25
root sendmail 57499 1 tcp4 206.117.18.9:25
202.89.161.10:2213
root sendmail 57499 3 tcp4 206.117.18.9:25
202.89.161.10:2213
root sendmail 57499 4 dgram -> /var/run/logpriv
root sendmail 57499 5 stream -> /var/run/clamav/milter.sock
root sendmail 57499 7 tcp4 206.117.18.9:25
202.89.161.10:2213
root sendmail 57463 1 tcp4 206.117.18.9:25
209.85.160.41:50379
root sendmail 57463 3 tcp4 206.117.18.9:25
209.85.160.41:50379
root sendmail 57463 4 dgram -> /var/run/logpriv
root sendmail 57463 5 stream -> /var/run/clamav/milter.sock
root sendmail 57463 7 tcp4 206.117.18.9:25
209.85.160.41:50379
root sendmail 57463 12 udp4 *:747 *:*
root sendmail 3457 3 tcp4 *:25 *:*
root sendmail 3457 4 dgram -> /var/run/logpriv
root sendmail 3457 5 tcp4 *:587 *:*
smmsp sendmail 26345 3 dgram -> /var/run/log
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