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 From:  tonabnehmer <tonabnehmer at web dot de>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  SIP packets blocked by firewall as "bad NAT"
 Date:  Tue, 23 Aug 2011 15:38:46 +0200

I'm using m0n0wall 1.33 generic PC. The firewall is blocking SIP 
packets, no matter if I open port 5060 or forward it to my VoIP phone. 
Firewall log entries look like that:

15:18:10.352452 bge0 @0:25 b <IP of VoIP provider>,5060 ->,5060 
PR udp len 20 32 IN bad NAT

I found this resolved topic, where Manuel Kasper wrote he fixed it: 

Is there something I'm doing wrong? Could it be the Broadcom NIC: 

Thank you!