Netstat -an readings

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I was running the netstat -an command and I noticed that I have multiple
connections to port 25 on my server. My mail sending has been slow, so I
am guessing this is the reason. What I don't understand is why this IP
has multiple connections established to my port 25. In total there are
13 connections. Is this a DOS attack or is this normal? I compared this
to our company mail server and there is nothing like this on it.


tcp        0      0 192.168.0.2:25          63.247.132.19:52355
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:52129
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:49572
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:52410
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:53274
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:52184
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:50527
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:51408
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:53012
ESTABLISHED
tcp        0      0 192.168.0.2:25          63.247.132.19:50805
ESTABLISHED

Richard Humphrey


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