I have Bind9 on Ubuntu 18.04 x64 LTS working as a cache and forwarding one. There are some forwarders IPs.
Server has 2 NICs (lan and wan) . BInd9 binds strictly to localhost and lan NICs, that is to 127.0.0.1 and 192.168.0.1. But when Bind9 forwards queries to external servers, it do it via wan interface but uses at the first onset server external IP as sources, which is not changed by SNAT or MASQUERADE Iptables. Unlike other soft, for example Asterisk, what is binded to lan interface only and uses internal (192.168.0.1) IP as source for outgoing packet and then iptables changes source address of such outgoing packets from internal to external using either SNAT or MASQUERADE. So how is to change Bind9 , what and where is to set up and waht setting that Bind9 would send forwarding packet via wan interface but would use address what it is binded to or internal, if it is binded to 127.0.0.1 and 192.168.0.1 ?
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