[Dnsmasq-discuss] iptables configuration drops packets

Adam Hardy adam.ant at cyberspaceroad.com
Fri May 16 19:30:01 BST 2008


I set up iptables myself today after using an obtusely written script for some 

I am trying to work out whether everything is in order and I am seeing logs from 
iptables saying that it is dropping packets from the machine every 12 minutes, 
which doesn't make sense - here's a line from the log:

May 16 19:21:10 isengard kernel: dropped from OUTPUT IN= OUT=eth1 
SRC= DST= LEN=237 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF 

The machine is running dhclient3 and dnsmasq and it acts as a gateway, serving 
dhcp to the internal lan on one NIC and forwarding packets to the internet via 
the other NIC (which gets its IP address via DHCP from the DSL modem)  - and 
this is the dhcp3.conf:

ddns-update-style none;
option domain-name "domain01";
option domain-name-servers,;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet netmask {
   option subnet-mask;
   option broadcast-address;
   option routers;

I'm trying to find out what the broadcast address is for and I'm pretty much in 
the dark despite looking around the mailing list and google.

Thanks for any advice,

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