Re: Matching packets by HTTP header "Host"

[Giovanni Lovato <giovanni.lovato@aldu.net>]

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Pascal Hambourg wrote:
> Hello,
>
> Giovanni Lovato a écrit :
>>
>> I'm trying to forward packets to different hosts depending on the "Host"
>> header in HTTP packets, e.g. packets on port 80 requesting "Host:
>> one.example.org" to 192.168.0.1 and all other on port 80 to 192.128.0.2.
>> I did:
>>
>> iptables -t nat -A PREROUTING -p TCP -i eth0 -m string --algo bm
>> - --string "Host: one.example.org" --destination-port 80 -j DNAT
>> - --to-destination 192.168.0.1
>>
>> iptables -t nat -A PREROUTING -p TCP -i eth0 --destination-port 80 -j
>> DNAT --to-destination 192.168.0.2
>>
>> But all packets are going to 192.168.0.2. Do I miss something?
>
> Rules in the 'nat' table apply only to the first packet of a new
> connection. NAT operations for the whole connection is determined by the
> NAT rules applied to the first (SYN) packet of the connection, which
> does not contain any HTTP payload data such as the "Host" header. So the
> first rule never matches a packet. As suggested, use a HTTP proxy instead.

Thank you all.
I used Apache mod_proxy_http to gain my needs!

G.L.
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