DNS routeing is actually DNS serving.
You need to install a DNS server and set it up properly to recive requests and forward them to the ISP's DNS server.
In slackware i know they include a small and very eazy to configure one but the name escapes me at the moment.
Quote:
i cannot run iptables cuz the ports are blocked and i will not received any mail
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Im not sure what you mean here. Iptables is the program used to interact with the routeing tables with the kernel.
read the man page for iptables for more information.