Mike Wohlgemuth wrote:
On Wed, October 17, 2007 2:05 pm, Ashley M. Kirchner wrote:One of our offices has several network ranges blocked in iptables (essentially '-A INPUT -s www.xxx.yyy.zzz/aa -j DROP'). What I'd like to do is create a log entry each time a packet is dropped, IF it matches any of those networks. I think I need to assign all of those networks to a "group" and then log dropped packets from that group only. And while I realize this might have other ramifications, such as logs growing exponentially, for now we're taking small steps. Later on I can then look for things like logging the same IP only once... So how do I tell iptables to create a group or name, or whatever it's called for those ranges, and then log dropped packets from those ranges only?Here's what I do: -N LOGDROP -A LOGDROP -j LOG --log-prefix "$IPTABLES drop:" -A LOGDROP -j DROP
Please, don't use all caps for user chains. The documentations says not to, because it may conflict with future netfilter names.
Then you can add lines for the things you want logged like this: -A INPUT -s www.xxx.yyy.zzz/aa -j LOGDROP I tend to use LOGDROP, rather than DROP, for everything I drop, except for some really common things. Mike
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