[CentOS] CentOS 4.4 and dns cache

Wed Apr 18 10:04:06 UTC 2007
Luciano Miguel Ferreira Rocha <strange at nsk.no-ip.org>

On Tue, Apr 17, 2007 at 10:55:19PM +0100, Mário Gamito wrote:
> Luciano Miguel Ferreira Rocha wrote:
> 
> > Then please do an strace of yum and tcpdump port 53 and send the logs
> > here.
> strace:
> write(2, "Cannot find a valid baseurl for "..., 45Cannot find a valid
> baseurl for repo: update
> ) = 45
> write(2, "Error: Cannot find a valid baseu"..., 52Error: Cannot find a
> valid baseurl for repo: update

An strace of the resolving process, not of error output, please.
> 
> [root at mail new]# tcpdump -vv port 53
> tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96
> bytes
> 22:55:01.978953 IP (tos 0x0, ttl  64, id 16651, offset 0, flags [DF],
> proto 17, length: 72) mail.telbit.pt.61225 >
> eth0-0.b.rbl-auth.sr.sonic.net.domain: [bad udp cksum 4532!]  42121 A?
> python.org.multi.surbl.org. (44)
> 22:55:02.526241 IP (tos 0x0, ttl  64, id 16651, offset 0, flags [DF],
> proto 17, length: 72) mail.telbit.pt.33261 > spamrbl2.mcafee.com.domain:
> [bad udp cksum ce00!]  51135 A? python.org.multi.uribl.com. (44)
> 22:55:03.104622 IP (tos 0x0, ttl  64, id 16651, offset 0, flags [DF],
> proto 17, length: 74) mail.telbit.pt.50508 > spamrbl2.mcafee.com.domain:
> [bad udp cksum ecfb!]  9692 A? virginia.edu.multi.surbl.org. (46)
> 22:55:03.104645 IP (tos 0x0, ttl  64, id 16656, offset 0, flags [DF],
> proto 17, length: 74) mail.telbit.pt.22097 > dnsbl.blacknight.ie.domain:
> [bad udp cksum f533!]  20583 A? virginia.edu.multi.uribl.com. (46)
> 22:55:01.983398 IP (tos 0x0, ttl  64, id 16661, offset 0, flags [DF],
> proto 17, length: 58) mail.telbit.pt.19802 > figwort.arin.net.domain:
> [bad udp cksum 7a97!]  40306 NS? virginia.edu. (30)
> 22:55:01.983600 IP (tos 0x0, ttl  64, id 16661, offset 0, flags [DF],
> proto 17, length: 86) mail.telbit.pt.56866 >
> xlns3.returnpath.net.domain:  42634[|domain]
> 22:55:01.983759 IP (tos 0x0, ttl  64, id 16661, offset 0, flags [DF],
> proto 17, length: 87) mail.telbit.pt.6123 > spns3.returnpath.net.domain:
>  63864[|domain]
> 22:55:01.998373 IP (tos 0x0, ttl  64, id 16676, offset 0, flags [DF],
> proto 17, length: 86) mail.telbit.pt.25387 >
> xlns1.returnpath.net.domain:  56267[|domain]
> 22:55:01.998596 IP (tos 0x0, ttl  64, id 16676, offset 0, flags [DF],
> proto 17, length: 78) mail.telbit.pt.1285 > ns6.njabl.org.domain: [bad
> udp cksum 71ed!]  28273 A? 33.24.109.194.combined.njabl.org. (50)

I don't see any reply, but these queries are for black lists only.

-- 
lfr
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