[SATLUG] Why are my ports 135,139,and 445 open?

Don Davis dondavis at reglue.org
Fri Dec 25 20:30:23 CST 2009

When I scan my laptop from outside I see:
135/tcp filtered msrpc
136/tcp filtered profile
137/tcp filtered netbios-ns
138/tcp filtered netbios-dgm
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds

However, netstat -patu does not show these ports listening.
I have also tried various variations on iptables rules with no success:
iptables -A INPUT -p udp --sport 445 -j REJECT
iptables -A INPUT -p udp --dport 445 -j REJECT

On the laptop and on the router with OpenWRT with no success. Thoughts?

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