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Port 1900 mystik



Hejsa,

På en firewall for en mindre boligforening der deler en ADSL forbindelse
kører jeg Shorewall og den er sat til at DROP'e al trafik til port
1900/udp, men når jeg med trafshow[1] ser på trafikken på maskinen kan
jeg med nogle få sekunders mellemrum se præcis 6 forbindelser til
239.255.255.250 port 1900/udp.
Nu ved jeg godt at 239.255.255.250 er en multicast port, og at trafikken
sikkert kommer fra tåbelige Windows XP maskiner der føler at de bliver
nødt til at belemre verden med UPnP broadcasts hele tiden, men hvorfor
hulen viser trafshow at forbindelserne sker fra 192.168.0.1
(firewall'ens IP)?

Er det ikke muligt at få al dens slags nettrafik droppet?
Det er IKKE muligt at gå ud og pille ved folks maskiner og få dem til at
lade være med at broadcaste :)

[1]http://soft.risp.ru/trafshow/index_en.shtml

-- 
Anders
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