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masquerading: who is this port?

Hi,
i have masqed my net completely. Now I get some spookie messages outside the wall:
12:06:50.296288 172.22.1.253.1153 > 192.36.148.17.domain:  21350 NS? . (17) (DF)
12:06:54.298714 172.22.1.253.1153 > 193.0.14.129.domain:  21350 NS? . (17) (DF)
12:06:58.301259 172.22.1.253.1153 > 128.9.0.107.domain:  21350 NS? . (17) (DF)
12:07:02.303648 172.22.1.253.1153 > 202.12.27.33.domain:  21350 NS? . (17) (DF)
There is a workstation that sends to different Servers, but can't reach dem (forbidden by our rulez).
Is there any way to find out, which workstation has the port 1153?
From inside the net I can't dump it, only from outside. With Astaro Webmin I can't find a topic to
determine, which ws has got this port.

mfg

dieter


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