[debian-lan-devel] No internet connection after converting minimal installation

Wed Jan 21 22:59:57 UTC 2015

On 01/18/2015 12:11 PM, Andreas B. Mundt wrote:
> Hi Afif,
Hi, Andi,
I'm sorry about my delayed response. I'm attaching the tcp dumps for 
what I've done below.
> I just explored this a bit on my setup.  It works the following way:
> If the local bind is asked to resolve an external address the first
> time, it asks the corresponding root name servers.  You can check this
> with the following command on the mainserver:
>
> sudo tcpdump -n -i eth1 port 53 | tee dump.txt
>
> and issuing something like "host debian.org" (with a hostname not
> resolved recently) on an other console.  You should get something
> like:
>
> 20:32:27.681205 IP 192.168.122.58.22099 > 199.249.120.1.53: 51434% [1au] A? debian.org. (39)
> 20:32:27.713782 IP 199.249.120.1.53 > 192.168.122.58.22099: 51434- 0/7/1 (389)
> 20:32:27.714188 IP 192.168.122.58.35583 > 192.54.112.30.53: 25309% [1au] A? dns1.easydns.com. (45)
> [...]
>
> My external IP address is 192.168.122.58 here, and you can see how the
> host 199.249.120.1 is asked to resolve debian.org.
>
> I guess this does not work in your network for some reasons, perhaps
> some firewall blocks accessing port 53 on the DNS servers, and you are
> forced to use the university's DNS server.    You could check this by
> adding 8.8.8.8 as forwarder and try if it still works.
With 8.8.8.8 as the forwarder, it no longer works. I'm attaching most of 
the tcpdump for this configuration (dump.txt). I had tried apt-get 
update before, and it looks like those attempted resolutions ended up 
getting caught in the log.
>
> But why does it work with local DNS switched off?  If you switch off
> local DNS, I suspect the local named is not asked, but the
> university's name server.  It is known to the mainserver as it's part
> of the DHCP negotiation.  You could check that with the tcpdump in the
> same way as above.
It looks like this is the case-- 130.191.1.1 is one of my university's 
DNS servers and it shows up here. It looks like what you're saying is 
the case. The dump here is the attached dump-no-local-dns.txt.
> Is the problem solved completely now?  Please let us know if there is
> still something unclear/missing.
I guess so. The cluster system we're currently using for production 
populates /etc/hosts for addresses on the internal network instead of 
providing DNS service with bind. It's a bit strange to require 
additional configuration in order to get the external network interface 
working again after setting up the mainserver. I think working with 
/etc/hosts instead might be a good way around that.
> Keep us up to date how things work out!
So would you like me to post general feedback to this mailing list? I'm 
really trying to push Debian LAN here so that we can take advantage of 
the numerous Debian packages and use them in our cluster.
>
> Best regards
>
>       Andi
Many thanks for your help!

Regards,
Afif
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12:45:14.724942 IP 146.244.227.106.6376 > 202.12.27.33.53: 38577% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
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12:45:16.725261 IP 146.244.227.106.52605 > 192.203.230.10.53: 27126% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:17.925250 IP 146.244.227.106.48594 > 8.8.8.8.53: 58333+% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:20.639138 IP 146.244.227.106.7407 > 192.203.230.10.53: 55323% [1au] NS? . (28)
12:45:20.639192 IP 146.244.227.106.53163 > 192.203.230.10.53: 323% [1au] AAAA? mainserver. (39)
12:45:20.639265 IP 146.244.227.106.43484 > 192.203.230.10.53: 52472% [1au] AAAA? mainserver.sdsu.edu. (48)
12:45:22.639253 IP 146.244.227.106.19278 > 192.5.5.241.53: 63314% [1au] NS? . (28)
12:45:22.639317 IP 146.244.227.106.33031 > 192.5.5.241.53: 304% [1au] AAAA? mainserver. (39)
12:45:22.639364 IP 146.244.227.106.56350 > 192.5.5.241.53: 40342% [1au] AAAA? mainserver.sdsu.edu. (48)
12:45:23.514023 IP 146.244.227.106.58087 > 192.203.230.10.53: 7842% [1au] AAAA? 0.debian.pool.ntp.org.sdsu.edu. (59)
12:45:23.514136 IP 146.244.227.106.60090 > 192.203.230.10.53: 65080% [1au] A? 0.debian.pool.ntp.org.sdsu.edu. (59)
12:45:23.639208 IP 146.244.227.106.61778 > 8.8.8.8.53: 22301+% [1au] AAAA? mainserver. (39)
12:45:23.639215 IP 146.244.227.106.20155 > 8.8.8.8.53: 55877+% [1au] NS? . (28)
12:45:24.925525 IP 146.244.227.106.62687 > 192.203.230.10.53: 30809% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:25.514259 IP 146.244.227.106.17920 > 192.5.5.241.53: 17192% [1au] AAAA? 0.debian.pool.ntp.org.sdsu.edu. (59)
12:45:25.514339 IP 146.244.227.106.36740 > 192.5.5.241.53: 44005% [1au] A? 0.debian.pool.ntp.org.sdsu.edu. (59)
12:45:26.514344 IP 146.244.227.106.5934 > 8.8.8.8.53: 12192+% [1au] A? 1.debian.pool.ntp.org. (50)
12:45:26.514448 IP 146.244.227.106.20675 > 8.8.8.8.53: 29292+% [1au] AAAA? 1.debian.pool.ntp.org. (50)
12:45:26.925756 IP 146.244.227.106.25011 > 192.5.5.241.53: 33239% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:27.925725 IP 146.244.227.106.20820 > 8.8.8.8.53: 38016+% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:30.839490 IP 146.244.227.106.55647 > 192.5.5.241.53: 24098% [1au] NS? . (28)
12:45:30.839501 IP 146.244.227.106.64841 > 192.5.5.241.53: 34895% [1au] AAAA? mainserver. (39)
12:45:32.839720 IP 146.244.227.106.47375 > 128.63.2.53.53: 24649% [1au] AAAA? mainserver. (39)
12:45:32.839727 IP 146.244.227.106.26162 > 128.63.2.53.53: 26302% [1au] NS? . (28)
12:45:33.714664 IP 146.244.227.106.17608 > 192.5.5.241.53: 5324% [1au] A? 1.debian.pool.ntp.org. (50)
12:45:33.714759 IP 146.244.227.106.38861 > 192.5.5.241.53: 30127% [1au] AAAA? 1.debian.pool.ntp.org. (50)
12:45:35.126053 IP 146.244.227.106.34840 > 192.5.5.241.53: 34366% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:35.714934 IP 146.244.227.106.12019 > 128.63.2.53.53: 7761% [1au] A? 1.debian.pool.ntp.org. (50)
12:45:35.715030 IP 146.244.227.106.53894 > 128.63.2.53.53: 43465% [1au] AAAA? 1.debian.pool.ntp.org. (50)
12:45:36.515283 IP 146.244.227.106.13791 > 8.8.8.8.53: 59982+% [1au] AAAA? 1.debian.pool.ntp.org.sdsu.edu. (59)
12:45:36.515306 IP 146.244.227.106.23652 > 8.8.8.8.53: 46895+% [1au] NS? . (28)
12:45:36.515395 IP 146.244.227.106.29764 > 8.8.8.8.53: 58886+% [1au] A? 1.debian.pool.ntp.org.sdsu.edu. (59)
12:45:37.126234 IP 146.244.227.106.65325 > 128.63.2.53.53: 9041% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:37.926265 IP 146.244.227.106.40794 > 8.8.8.8.53: 20112+% [1au] PTR? 140.28.191.130.in-addr.arpa. (56)
12:45:43.915603 IP 146.244.227.106.25180 > 128.63.2.53.53: 18038% [1au] AAAA? 1.debian.pool.ntp.org.sdsu.edu. (59)
12:45:43.915612 IP 146.244.227.106.11940 > 128.63.2.53.53: 33227% [1au] NS? . (28)
12:45:43.915687 IP 146.244.227.106.51979 > 128.63.2.53.53: 53947% [1au] A? 1.debian.pool.ntp.org.sdsu.edu. (59)
12:45:45.326463 IP 146.244.227.106.23406 > 128.63.2.53.53: 7223% [1au] PTR? 140.28.191.130.i
-------------- next part --------------
14:31:07.622493 IP 146.244.227.106.39065 > 130.191.1.1.53: 40312+ A? debian.org. (28)
14:31:07.627058 IP 130.191.1.1.53 > 146.244.227.106.39065: 40312 6/5/10 A 130.89.148.14, A 128.31.0.62, A 5.153.231.4, A 140.211.15.34, A 150.203.164.38, A 200.17.202.197 (483)
14:31:07.627483 IP 146.244.227.106.42904 > 130.191.1.1.53: 42478+ AAAA? debian.org. (28)
14:31:07.638413 IP 130.191.1.1.53 > 146.244.227.106.42904: 42478 3/5/10 AAAA 2001:610:1908:b000::148:14, AAAA 2001:388:1034:2900::26, AAAA 2001:41c8:1000:21::21:4 (471)
14:31:07.638755 IP 146.244.227.106.39663 > 130.191.1.1.53: 56230+ MX? debian.org. (28)
14:31:07.639721 IP 130.191.1.1.53 > 146.244.227.106.39663: 56230 2/5/10 MX muffat.debian.org. 0, MX mailly.debian.org. 0 (433)
14:31:15.318462 IP 146.244.227.106.21404 > 198.41.0.4.53: 14042% [1au] A? www.google.com. (43)
14:31:15.318536 IP 146.244.227.106.20517 > 198.41.0.4.53: 37480% [1au] NS? . (28)
14:31:16.118033 IP 146.244.227.106.33479 > 192.58.128.30.53: 47972% [1au] A? www.google.com. (43)
14:31:16.118107 IP 146.244.227.106.37482 > 192.58.128.30.53: 9338% [1au] NS? . (28)
14:31:16.918673 IP 146.244.227.106.55336 > 192.33.4.12.53: 10167% [1au] A? www.google.com. (43)
14:31:16.918785 IP 146.244.227.106.18617 > 192.33.4.12.53: 40682% [1au] NS? . (28)
14:31:17.718750 IP 146.244.227.106.21641 > 199.7.83.42.53: 41582% [1au] A? www.google.com. (43)
14:31:17.718834 IP 146.244.227.106.55862 > 199.7.83.42.53: 498% [1au] NS? . (28)
14:31:18.519097 IP 146.244.227.106.53931 > 128.63.2.53.53: 23541% [1au] A? www.google.com. (43)
14:31:18.519199 IP 146.244.227.106.46932 > 128.63.2.53.53: 30676% [1au] NS? . (28)
14:31:19.319430 IP 146.244.227.106.27384 > 192.228.79.201.53: 25789% [1au] A? www.google.com. (43)
14:31:19.319524 IP 146.244.227.106.9108 > 192.228.79.201.53: 30777% [1au] NS? . (28)
14:31:20.119499 IP 146.244.227.106.5118 > 193.0.14.129.53: 42670 A? www.google.com. (32)
14:31:20.119633 IP 146.244.227.106.22836 > 193.0.14.129.53: 14796 NS? . (17)
14:31:20.919891 IP 146.244.227.106.11541 > 192.112.36.4.53: 29424% [1au] A? www.google.com. (43)
14:31:20.919981 IP 146.244.227.106.23282 > 192.112.36.4.53: 36322% [1au] NS? . (28)
14:31:21.720037 IP 146.244.227.106.31215 > 192.203.230.10.53: 35046 A? www.google.com. (32)
14:31:21.720129 IP 146.244.227.106.46846 > 192.203.230.10.53: 48066 NS? . (17)
14:31:22.520623 IP 146.244.227.106.42304 > 192.5.5.241.53: 16476% [1au] A? www.google.com. (43)
14:31:22.520734 IP 146.244.227.106.26824 > 192.5.5.241.53: 39733% [1au] NS? . (28)
14:31:23.320759 IP 146.244.227.106.50854 > 199.7.91.13.53: 14967 A? www.google.com. (32)
14:31:23.320831 IP 146.244.227.106.7330 > 199.7.91.13.53: 5303 NS? . (17)
14:31:24.121558 IP 146.244.227.106.25687 > 192.36.148.17.53: 53032% [1au] A? www.google.com. (43)
14:31:24.121703 IP 146.244.227.106.12800 > 192.36.148.17.53: 63941% [1au] NS? . (28)
14:31:24.921824 IP 146.244.227.106.5673 > 202.12.27.33.53: 18335% [1au] A? www.google.com. (43)
14:31:24.921892 IP 146.244.227.106.39932 > 202.12.27.33.53: 33967% [1au] NS? . (28)
14:32:53.894725 IP 146.244.227.106.44665 > 130.191.1.1.53: 45515+ A? yahoo.com. (27)
14:32:53.895498 IP 130.191.1.1.53 > 146.244.227.106.44665: 45515 3/6/8 A 206.190.36.45, A 98.138.253.109, A 98.139.183.24 (335)
14:32:53.895886 IP 146.244.227.106.42522 > 130.191.1.1.53: 4263+ AAAA? yahoo.com. (27)
14:32:53.896544 IP 130.191.1.1.53 > 146.244.227.106.42522: 4263 0/1/0 (88)
14:32:53.896789 IP 146.244.227.106.42051 > 130.191.1.1.53: 2890+ MX? yahoo.com. (27)
14:32:53.897877 IP 130.191.1.1.53 > 146.244.227.106.42051: 2890 3/6/16 MX mta5.am0.yahoodns.net. 1, MX mta7.am0.yahoodns.net. 1, MX mta6.am0.yahoodns.net. 1 (470)
14:33:02.587312 IP 146.244.227.106.60241 > 130.191.1.1.53: 49779+ A? github.com. (28)
14:33:02.594005 IP 130.191.1.1.53 > 146.244.227.106.60241: 49779 1/4/4 A 192.30.252.131 (194)
14:33:02.594349 IP 146.244.227.106.50708 > 130.191.1.1.53: 29253+ AAAA? github.com. (28)
14:33:02.601904 IP 130.191.1.1.53 > 146.244.227.106.50708: 29253 0/1/0 (93)
14:33:02.602142 IP 146.244.227.106.34602 > 130.191.1.1.53: 3606+ MX? github.com. (28)
14:33: