The state of DNS settings on our SIP servers
Emin Gabrielyan
2008-9-23
DNS settings on fr1.youroute.net, fr2.youroute.net, fr3.youroute.net, and fr4.youroute.net servers
Only fr1.youroute.net and fr4.youroute.net servers point to our DNS servers. SIP servers fr2.youroute.net and fr3.youroute.net do not point to our DNS servers.
Servers 208.67.222.222, 208.67.220.220, and 213.186.33.99 are the DNS servers of http://www.opendns.com/ and of OVH [more] respectively.
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr1.youroute.net "cat /etc/resolv.conf"
DSA host key for IP address '91.121.66.202' not in list of known hosts.
nameserver 127.0.0.1
#nameserver 87.98.129.217
#nameserver 82.103.130.91
#nameserver 208.67.222.222
#nameserver 208.67.220.220
#nameserver 213.186.33.99
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr1.youroute.net "grep -A6 forwarders\ \{ /etc/namedb/named.conf"
DSA host key for IP address '91.121.66.202' not in list of known hosts.
forwarders {
87.98.129.217;
82.103.130.91;
208.67.222.222;
208.67.220.220;
213.186.33.99;
};
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr2.youroute.net "cat /etc/resolv.conf"
DSA host key for IP address '91.121.19.149' not in list of known hosts.
#nameserver 127.0.0.1
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 213.186.33.99
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr3.youroute.net "cat /etc/resolv.conf"
DSA host key for IP address '91.121.101.126' not in list of known hosts.
#nameserver 127.0.0.1
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 213.186.33.99
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr4.youroute.net "cat /etc/resolv.conf"
nameserver 127.0.0.1
#nameserver 87.98.129.217
#nameserver 82.103.130.91
#nameserver 208.67.222.222
#nameserver 208.67.220.220
#nameserver 213.186.33.99
Emin.Gabrielyan@pc8 ~
$ ssh sona@fr4.youroute.net "grep -A4 forwarders\ \{ /etc/namedb/named.conf"
forwarders {
87.98.129.217;
82.103.130.91;
};
DNS servers 87.98.129.217 and 82.103.130.91
87.98.129.217 and 82.103.130.91 are our master and slave servers hosted at OVH and Easyspeedy respectively.
Emin.Gabrielyan@pc8 ~
$ ssh sona@87.98.129.217 "grep -A4 zone\ .youroute.net /etc/bind/named.conf.local"
sona@87.98.129.217's password:
zone "youroute.net" {
type master;
file "db.youroute.net";
allow-transfer { 82.103.130.91; };
};
Emin.Gabrielyan@pc8 ~
$ ssh sona@82.103.130.91 "grep -A5 zone\ .youroute.net /etc/bind/named.conf.local"
sona@82.103.130.91's password:
zone "youroute.net" {
type slave;
file "db.youroute.net.bk";
masters { 87.98.129.217; };
notify no;
};
Emin.Gabrielyan@pc8 ~
DNS settings of fr2 and fr3 SIP servers are changed
The two SIP servers fr2 and fr3 are now reconfigured and are pointing to our primary DNS server 87.98.129.217 in OVH.
fr2#
fr2# /var/sipenv-91.121.19.149/etc/rc.d/sip.sh restart
Stop PortaSIP[/var/sipenv-91.121.19.149], shutdown is in progress ........ done.
Starting PortaSIP[/var/sipenv-91.121.19.149] done.
fr2# cat /etc/resolv.conf
#nameserver 127.0.0.1
nameserver 87.98.129.217
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 213.186.33.99
fr2#
fr2#
fr3#
fr3#
fr3# /var/sipenv-91.121.101.126/etc/rc.d/sip.sh restart
Stop PortaSIP[/var/sipenv-91.121.101.126], shutdown is in progress ........... done.
Starting PortaSIP[/var/sipenv-91.121.101.126] done.
fr3# cat /etc/resolv.conf
#nameserver 127.0.0.1
nameserver 87.98.129.217
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 213.186.33.99
fr3#
fr3#
The screenshot below shows the log of queries on the primary server. We see queries arriving from fr2 and fr3 SIP servers:
sona@r11819:~$
sona@r11819:~$ tail -5 /var/log/named/queries.log
23-Sep-2008 15:08:22.643 queries: info: client 91.121.101.126#55256: query: _sip._udp.sip12.youroute.net.youroute.net IN SRV +
23-Sep-2008 15:08:22.644 queries: info: client 91.121.101.126#65070: query: sip12.youroute.net IN A +
23-Sep-2008 15:08:22.646 queries: info: client 91.121.101.126#63663: query: _sip._udp.sip12.youroute.net IN SRV +
23-Sep-2008 15:08:22.646 queries: info: client 91.121.101.126#62495: query: _sip._udp.sip12.youroute.net.youroute.net IN SRV +
23-Sep-2008 15:08:22.647 queries: info: client 91.121.101.126#57182: query: sip12.youroute.net IN A +
sona@r11819:~$
sona@r11819:~$ tail -5 /var/log/named/queries.log
23-Sep-2008 15:08:29.616 queries: info: client 91.121.19.149#53025: query: _sip._udp.sip10.youroute.net.youroute.net IN SRV +
23-Sep-2008 15:08:29.616 queries: info: client 91.121.19.149#62549: query: sip10.youroute.net IN A +
23-Sep-2008 15:08:29.617 queries: info: client 91.121.19.149#62753: query: _sip._udp.sip10.youroute.net IN SRV +
23-Sep-2008 15:08:29.618 queries: info: client 91.121.19.149#50615: query: _sip._udp.sip10.youroute.net.youroute.net IN SRV +
23-Sep-2008 15:08:29.618 queries: info: client 91.121.19.149#64909: query: sip10.youroute.net IN A +
sona@r11819:~$
sona@r11819:~$
Configuration files of the master DNS server
/var/cache/bind/db.switzernet.com
/var/cache/bind/db.youroute.net
Related problem
http://switzernet.com/public/080923-ovh-sip-cpu/
http://unappel.ch/public/080923-ovh-sip-cpu/