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IPTable & Docker: fixing outgoing IP to a dedicated public IP (from host IP to dedicated IP)

I have a server with a set of additional IPs on which I can launch & attach a docker instance.

The easiest way is to use -p option (-p IP:port:port) of docker.

Alternatively, we also manage to use the IPs using a dedicated docker network & a set of iptables PREROUTING/POSTROUTING rules

ie:

docker network create --driver bridge --subnet=[login to view URL] --opt "[login to view URL]"="docker1" docker1

then

/sbin/ip addr add EXTERNAL_IP dev inducido

Then

add route command for the gateway

then

iptables -t nat -A PREROUTING -d EXTERNAL_IP -j DNAT --to-destination INTERNAL_IP

and several other rules.

Everything works well, except that the outside world sees the host's IP for outgoing traffic.

I need someone expert with network & iptables to fix this, namely every packet going out of the docker instance shall be associated with the related IP.

(Debian 10 server)

Skills: Linux, System Admin, DNS, Network Administration, Docker

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( 69 reviews ) 13710, France

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udayarpandey2022

I can give it a try. May be I can help you. Thanks!

$30 USD in 7 days
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