Trouble getting OS fingerprinting to work in iptables

Posted by user1197457 on Server Fault See other posts from Server Fault or by user1197457
Published on 2013-11-01T21:38:58Z Indexed on 2013/11/01 21:56 UTC
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linux

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iptables

Everyone, As I understand it, OSF has been merged with the Kernel since 2.6.before-my-kernel-version. Yet when I do something like this:

iptables -I INPUT -j ACCEPT -p tcp -m osf --genre Linux --log 0 --ttl 2

and I get an error like:

iptables: No chain/target/match by that name

iptables -L

Shows no rules because I did an iptables -F at one point.

ALSO, the following command:

cat /proc/net/ip_tables_matches

Does not show "osf" on the list.

A google doesn't seem to help. I've also installed iptables-devel in hopes I'd be able to load the osf module. Sadly I haven't been able to get that to work.

Centos 6.4 minimal

Any guidance?

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