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Dear all:
this is my situation,there are serval hosts with private IP
connected to the Linux box and the Linux box connected to internet (ISP)
through(PPPoE, ADSL, Cablemodems...),it looks like:
---------
_____
| ISP | <===> | DNS | (61.218.111.1:53)
--------- --------
|
(61.218.111.49)
|
-------------------
(61.218.111.50)
|Linux (2.4.19)|
------------------- (10.0.0.1)
/ | | \
H1 H2 .... Hn
(10.0.0.2) (10.0.0.3) (10.0.0.x)
i want the Linux box work as a DNS relay server, that is, any host send a DNS
request to Linux, it will forward the request to the ISP's DNS server. So I
think NAT can do this,for example:
1.H1 send a DNS request to Linux box(s:10.0.0.2/d:10.0.0.1)
2.Linux box translate the packet and forward it to ISP's DNS
server(s:61.218.111.50/d:61.218.111.1)
3.Then the reply coming back (s:61.218.111.1/d:61.218.111.50)
4.here is the problem...Linux box must de-SNAT for the packet to the original
host(s:10.0.0.1/d:?????)
In detail:
$IPTABLES -A PREROUTING -t nat -p tcp -d 61.218.111.50 --dport 53 \
-j DNAT --to ?????:53
(How can i assign the hostIP? Because there is no info for me to know the
original host who sends the request!!
Does NAT Server will de-SNAT for me in kernel(many docs say this, but i don't
know how it did? Should I still
assign the hostIP manually. ) And if nat can't work, is there any solution for
DNS relay?)
Any Comment, Appreciate!!
best rgs.
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