sshd doing dns queries on localhost?

Mon May 26 10:06:32 PDT 2003

Hello Fernando,

FAQ.
for example  see
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http://www.freebsd.org/cgi/search.cgi?words=sshd+resolv.conf+privsep&max=25&sort=score&index=all&source=freebsd-security
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(URL can be wrapped)

Monday, May 26, 2003, 8:32:55 PM, you wrote:

FS> Hi,
FS>         I noted on my 4.7 machines that when a ssh conection is made, the
FS> following PTR query happens (10.11.1.11 is the src address in the example):

FS> 13:23:21.120290 PUBLIC_IP.4523 > PUBLIC_IP.53:  52788+ PTR?
FS> 11.1.11.10.in-addr.arpa. (41)
FS> 13:23:21.120517 PUBLIC_IP.4524 > PUBLIC_IP.53:  52788+ PTR?
FS> 11.1.11.10.in-addr.arpa. (41)
FS> 13:23:21.120683 PUBLIC_IP.4525 > PUBLIC_IP.53:  52788+ PTR?
FS> 11.1.11.10.in-addr.arpa. (41)
FS> 13:23:21.120784 PUBLIC_IP.4526 > PUBLIC_IP.53:  52788+ PTR?
FS> 11.1.11.10.in-addr.arpa. (41)

FS>         This is very weird because resolv.conf points to another server. Also,
FS> the capture is from lo0.

FS>         Not that I see a security problem here (just the annoyance of this
FS> filling my log_in_vain logs), but I'm curious about the reason; at least didn't
FS> find any clue looking at source.

FS> May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4523
FS> May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4524
FS> May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4525
FS> May 26 13:23:21 X /kernel: Connection attempt to UDP PUBLIC_IP:53 from PUBLIC_IP:4526

FS>         Thanks for any pointer!

FS>         Regards!

FS> Fernando.
FS> _______________________________________________
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;-------------------------------------------
; NKritsky
; mailto:nkritsky at internethelp.ru