[prev in list] [next in list] [prev in thread] [next in thread] 

List:       opensuse
Subject:    Re: [opensuse] Re: When I have downloads running, DNS fails.
From:       Per Jessen <per () computer ! org>
Date:       2014-07-14 17:33:50
Message-ID: lq14eg$rea$1 () saturn ! local ! net
[Download RAW message or body]

Carlos E. R. wrote:

> cer@Telcontar:~> dig smtp.telefonica.net
> 
> ; <<>> DiG 9.9.4-rpz2.13269.14-P2 <<>> smtp.telefonica.net
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22149
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 25
> 
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ;; QUESTION SECTION:
> ;smtp.telefonica.net.           IN      A
> 
> ;; ANSWER SECTION:
> smtp.telefonica.net.    184     IN      A       86.109.99.70
> 
> ;; AUTHORITY SECTION:
> .                       5573    IN      NS      c.root-servers.net.
> .                       5573    IN      NS      m.root-servers.net.
> .                       5573    IN      NS      i.root-servers.net.
> .                       5573    IN      NS      a.root-servers.net.
> .                       5573    IN      NS      e.root-servers.net.
> .                       5573    IN      NS      g.root-servers.net.
> .                       5573    IN      NS      f.root-servers.net.
> .                       5573    IN      NS      k.root-servers.net.
> .                       5573    IN      NS      d.root-servers.net.
> .                       5573    IN      NS      j.root-servers.net.
> .                       5573    IN      NS      h.root-servers.net.
> .                       5573    IN      NS      b.root-servers.net.
> .                       5573    IN      NS      l.root-servers.net.
> 
> ;; ADDITIONAL SECTION:
> a.root-servers.net.     191424  IN      A       198.41.0.4
> a.root-servers.net.     193089  IN      AAAA    2001:503:ba3e::2:30
> b.root-servers.net.     194508  IN      A       192.228.79.201
> b.root-servers.net.     32436   IN      AAAA    2001:500:84::b
> c.root-servers.net.     69101   IN      A       192.33.4.12
> c.root-servers.net.     4779    IN      AAAA    2001:500:2::c
> d.root-servers.net.     105809  IN      A       199.7.91.13
> d.root-servers.net.     28599   IN      AAAA    2001:500:2d::d
> e.root-servers.net.     200517  IN      A       192.203.230.10
> f.root-servers.net.     58737   IN      A       192.5.5.241
> f.root-servers.net.     4780    IN      AAAA    2001:500:2f::f
> g.root-servers.net.     201930  IN      A       192.112.36.4
> h.root-servers.net.     230382  IN      A       128.63.2.53
> h.root-servers.net.     55823   IN      AAAA    2001:500:1::803f:235
> i.root-servers.net.     230382  IN      A       192.36.148.17
> i.root-servers.net.     34338   IN      AAAA    2001:7fe::53
> j.root-servers.net.     232769  IN      A       192.58.128.30
> j.root-servers.net.     20143   IN      AAAA    2001:503:c27::2:30
> k.root-servers.net.     89299   IN      A       193.0.14.129
> k.root-servers.net.     30023   IN      AAAA    2001:7fd::1
> l.root-servers.net.     119048  IN      A       199.7.83.42
> l.root-servers.net.     62187   IN      AAAA    2001:500:3::42
> m.root-servers.net.     66051   IN      A       202.12.27.33
> m.root-servers.net.     26222   IN      AAAA    2001:dc3::35

When I did the same, I got this:

# dig smtp.telefonica.net

; <<>> DiG 9.4.2 <<>> smtp.telefonica.net
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34049
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1

;; QUESTION SECTION:
;smtp.telefonica.net.           IN      A

;; ANSWER SECTION:
smtp.telefonica.net.    299     IN      A       86.109.99.70

;; AUTHORITY SECTION:
telefonica.net.         299     IN      NS      artemis.ttd.net.
telefonica.net.         299     IN      NS      marianela.tsm.es.

;; ADDITIONAL SECTION:
marianela.tsm.es.       172799  IN      A       194.224.100.67


> 
> ;; Query time: 114 msec
> ;; SERVER: 192.168.1.14#53(192.168.1.14)
> ;; WHEN: Mon Jul 14 15:56:18 CEST 2014
> ;; MSG SIZE  rcvd: 788
> 
> cer@Telcontar:~>
> 
> 
> 
> Despite me having on /etc/named.conf
> 
>   forwarders { 80.58.61.250; 80.58.61.254; 208.67.222.222; 8.8.8.8; };
>   forward first;
> 
> it is asking the root servers.

Add '+trace' to your dig options, then try again.  I have seen the same
result sometimes, I don't know why, but usually +trace will tell you
exactly what was queried etc.

> In fact, that's one of the addresses that nags me, because when I want
> to send an email during a busy time (full pipe), they fail simply
> because my postfix can not verify my own email address. Even if I did
> send an email a while before, it doesn't remember the address. And it
> is bind, no memory restraints. Not the router.

The first cache is in nscd, then bind, then uplink name-servers. 

> I know they are different; but the current problem, which is simply
> getting queries done, is basically the same: the router performance
> when the ADSL pipe is full.

It is an interesting issue, definitely - even if it may not be worth
pursuing. 

> Ok, but none of that benefits me at present. The basic problem is that
> my router does not do QoS, and does not prioritize DNS packets. So
> when the pipe is full, they don't get out, or in, simple as that...

Just out of curiosity, have you tried assigning a QoS class to port 53
(on the originating machine) ?  It is easily done with iptables. 



-- 
Per Jessen, Zürich (16.9 °C)
http://www.hostsuisse.com/ - dedicated server rental in Switzerland.

--
To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org
To contact the owner, e-mail: opensuse+owner@opensuse.org

[prev in list] [next in list] [prev in thread] [next in thread]