eMasterServer
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Master Server Steam based in PHP
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You need to fill the array listIp with all of you address that you want to be
listed by the Master Server

Doesn't manage filter !

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This tools is used for lan, when the LAN tab doesn't works, this will works always !
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Requirements:
Sockets extension
PHP 5.3 (5.2)

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iptables script
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iptables -t nat -A PREROUTING -p tcp -d hl2master.steampowered.com --dport 27011 -j DNAT --to-destination yourip:port


Links:
http://esport-tools.net
https://developer.valvesoftware.com/wiki/Master_Server_Query_Protocol