Mailinglist Archive: opensuse (4053 mails)

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Re: [SLE] Various security questions
Many MANY thanks for all that replied...very helpfull information all

Thanks again,

John Marquardt
----- Original Message -----
From: "Rick Green" <rtg@xxxxxxxx>
To: "John Marquardt" <marquardt@xxxxxxxxxxxxxx>
Cc: <suse-linux-e@xxxxxxxx>
Sent: Wednesday, August 08, 2001 11:07 PM
Subject: Re: [SLE] Various security questions

> On Wed, 8 Aug 2001, John Marquardt wrote:
> > case I'm not too worried about that. However, I've noticed a LOT of
> > like this in the log:
> >
> > Packet log: input ACCEPT eth0 PROTO=1 myip:0 L=43
> >
> > (or L=81, also 'myip' is my ip address, and not a quote from the log)
> > various other information from the log. My main question is what is
> > '0' used for?
> That's an ICMP 'echo' request, also known as a 'ping'.
> ICMP (proto=1) doesn't use ports like TCP and UDP do, so those positions
> in the log are used for icmp message type (on the source address) and code
> (on the destination address).
> For future reference, the PROTO= values are documented in
> /etc/protocols, the ports for TCP(6) and UDP(17) are documented in
> /etc/services, and the ICMP(1) types and codes are in
> /usr/src/linux/include/linux/icmp.h
> --
> Rick Green
> "I have the heart of a little child, and the brain of a genius.
> ... and I keep them in a jar under my bed"
> --
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