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IP_MASQ: reverse ICMP: failed checksum from , what does this mean??
Name: slvrfx Date: November 15, 2000 at 14:03:41 Pacific
Comment:
I run a Halflife dedicated game server on Redhat Linux 7.0. After a few days of running I see this message pop-up on the screen. What does it mean? Is someone trying to hack my box?
It gives me the error "IP_MASQ: reverse ICMP: failed checksum from ", where the is a valid address.
Please help me with anything you know about this and thanx so much!!!
Name: Ben Carter Date: December 28, 2000 at 09:59:13 Pacific
Reply:
I get the same error. My box crashes also.
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Response Number 2
Name: peter Date: January 12, 2001 at 16:39:38 Pacific
Reply:
I have this same message 100's of times. What is IP mastquerading? How do I switch it off? Any help much appreciated at my email.
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Response Number 3
Name: Rob Date: January 21, 2001 at 21:47:52 Pacific
Reply:
I also have the same thing happanig any help would be nice.
bobertperry@icqmail.com
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Response Number 4
Name: nathan Date: January 22, 2001 at 04:55:40 Pacific
Reply:
in /etc/sysconfig/network (if your using redhat) put in
FOREWARD_IPV4=false but i am ip masqing and i get the error too. any more info much appreciated
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Response Number 5
Name: foo Date: February 10, 2001 at 09:40:39 Pacific
Reply:
I'm running a Quake3 server on a "machine".
I believe you get this error when someone is sending spoofed packets to your machine- i.e. you are being scanned by a hacker or most likely a script kiddie. A hacker ought to have the skill to recompute the checksum when spoofing an address in a datagram packet. A script kiddie likely does not.
There's not much you can do to prevent a scan. Just make sure you aren't running that has a security hole, because the scanning is an indication that someone is looking for those security holes.
Summary: Since few days back, I get popup message in my screen saying "IP_MASQ: reverse ICMP: failed checksum from xxx.yyy.zzz where xxx.yyy.zzz is a public IP. ...
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