Re: why scapy packet no effected by ip tables

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Obviously you are doing this for DNS, you need TCP too. If a DNS request or response is larger than 512 bytes it will use TCP.

Jeff White - GNU+Linux Systems Administrator
University of Pittsburgh - CSSD

On 07/20/2014 12:27 PM, Paul Robert Marino wrote:
look at ebtables instead.


On Thu, Jul 17, 2014 at 11:23 AM, Phil Oester <kernel@xxxxxxxxxxxx> wrote:
On Wed, Jul 16, 2014 at 05:16:21PM +0430, Abogholo A wrote:
i wrote this rule for change all udp destination ip address to 8.8.8.8
when dport is 53:

iptables -t nat -A OUTPUT -p udp -m udp --dport 53 -j DNAT
--to-destination 8.8.8.8

but when send this packet

sr1(IP(dst="4.2.2.4")/UDP()/DNS(rd=1,qd=DNSQR(qname="iranled.com")))

iptables no effected to them

why?

Scapy uses raw sockets, which don't go through iptables.

Phil
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