DNS Port Forward Centos 7

Mahdi Akrami

10/6/23, 9:27 AM

how i can have this config?

Server A --> use Server B ip as nameserver in /etc/resolve.conf
Server B --> forward all req on port 53 to Server C:53 using iptables
Server C --> resolve incoming dns queries

Server B iptables config:

iptables -t nat -A PREROUTING -p tcp --dport 53 -j DNAT --to-destination Server_C:53
iptables -t nat -A PREROUTING -p udp --dport 53 -j DNAT --to-destination Server_C:53
iptables -t nat -A POSTROUTING -j MASQUERADE

but now i get timeout in server A dns queries

146

0 + 5

domain-name-system

iptables

centos

port-forwarding

djdomi

10/6/23, 10:25 AM

why not use on b a Nameserver that query c only? it makes more sense to me. but why you chaining these servers?

Mahdi Akrami

10/6/23, 10:57 AM

Server C is blocking in my country . but i can access Server C From Server B i want all my Clients use server B as nameserver then server B use Server C to resolve queries

djdomi

10/6/23, 5:33 PM

and why do you think that a port redirection is the best way to go? in the same manner you could basically setup a vpn on port 443. but we are not allowed to support breaking the law

Mahdi Akrami

10/6/23, 6:04 PM

if you have any suggestion i am open to hear that . i simply explain the that i think is right if you have better way to do that please explain .

Mahdi Akrami

10/6/23, 6:05 PM

breaking the law ? dude i am in iran ! the government block internet access and people stock in iran . i am helping my people to access internet

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: DNS Port Forward Centos 7

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