i'm a bit new to F5OS & need some help. i have fresh unpacked r2800 which i configured with 2 domestic DNSs only in RFC1918. But when i watch on tcpdump i can see chassis queries google DNSs along with domestic those:
12:20:21.423548 IP appliance-1.chassis.local.37917 > 188.8.131.52.domain: 48039+ AAAA? api.f5.com. (28)
12:20:21.423614 IP appliance-1.chassis.local.56070 > 184.108.40.206.domain: 17071+ A? api.f5.com. (28)
12:20:21.491076 IP appliance-1.chassis.local.56970 > <DOMESTIC-DNS>.domain: 48845+ PTR? 220.127.116.11.in-addr.arpa. (38)
12:20:25.423992 IP appliance-1.chassis.local.51778 > 18.104.22.168.domain: 17071+ A? api.f5.com. (28)
12:20:25.423992 IP appliance-1.chassis.local.57664 > 22.214.171.124.domain: 48039+ AAAA? api.f5.com. (28)
/etc/resolv.conf doesnt contain anything else except domestic DNSs. i'm a bit surprised... how can i disable querying google DNSs?
Solved! Go to Solution.
Hello @Andy-didnt-like-uucp ,
rSeries has its own interface to configure those DNS settings.
I recommend you to check this info
Please, let me know if this helps.
in the 1st approach i shouldnt face it as per
When there is no dns server configured on host, the docker will use 126.96.36.199 and 188.8.131.52 to forward the dns request from docker containers. This is how docker behaves by design"
bc i have DNS servers configured :0)
F5LB01# show system dns
system dns state search [ <internal-domain-sanitized> ]
ADDRESS ADDRESS PORT
10.XX.YY.49 - 53
10.XX.YY.50 - 53
in the 2nd iteration how i can be sure i've restarted docker?
As a workaround you can set a fake internal ip which does not exist as dns server as block hole
Once you have custom DNS configured you need to restart docker