[Bug 966] New: iptables can't change or drop or any effect on scapy packet!

bugzilla-daemon at netfilter.org bugzilla-daemon at netfilter.org
Wed Jul 16 23:09:36 CEST 2014


           Summary: iptables can't change or drop or any effect on scapy
           Product: iptables
           Version: 1.4.x
          Platform: All
        OS/Version: Ubuntu
            Status: NEW
          Severity: major
          Priority: P5
         Component: iptables
        AssignedTo: netfilter-buglog at lists.netfilter.org
        ReportedBy: persianjambon at yahoo.com
   Estimated Hours: 0.0

this is my commnad:

iptables  -I OUTPUT -p udp -m udp --dport 53 -j DROP

and i create and send scapy packet:


but iptable not DROP this packet!!!


this rule:

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

and all scapy pcket hoing to

tcpdump output:
04:43:00.442453 IP > UDP, length 29
04:43:00.855930 IP > UDP, length 45


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