My ADSL modem is going active when I'm not doing anything. GKRellm indicates disc and eth0 activity; lots of it. This is when it should be idle. So, what do I look for?
The machine runs Debian Linux (upgraded from Libranet 2.0. There is no other OS on it. I have Firestarter running. There is an anti-rootkit tool. I have Tripwire but don't really know what to do with it. I've looked in Syslog, but can't tell anything useful.
How do I tell what's happening? If I have been invaded, how do I tell? What do I do next?
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something is using my modem
It means that the computer which has the IP of 210.65.231.206 wants to communicate with 216.86.126.220, but it doesn't know its MAC address. Every communication through etherenet networks go by MAC address. So, if a computer wants to know where to send a TCP frame, it needs the MAC address of the recipient. If it doesn't know, it sends a broadcast request such as the one you mentioned, and waits for an answer.
It seems like if 210.65.231.206 wanted to send something for 216.86.126.220, but this host does not exists, or offline, or something like this.
It seems like if 210.65.231.206 wanted to send something for 216.86.126.220, but this host does not exists, or offline, or something like this.
Id did a whois on that IP and got:
What?$ whois 210.65.231.206
Precious Technology Ltd.
11F, No. 263, Sec. 4, Hsin Yi Rd,
Taipei
TW
Netname: PATELE-NET
Netblock: 210.65.231.128/25
Administrator contact:
Sam Chen (SC8-TW) sam1215@tpts8.seed.net.tw
+886-2-2754-1700
Technical contact:
AL Kuo (AK14-TW) kuo@patele.com
+886-2-2754-1700