> I run a firewall using ipchains on linux-2.2.18. My system log files
> seem to contain a lot of firewall rejects for icmp connections from
> various ip addresses, all referring to icmp connections from "port" 8
> to "port" 0.
Those Ports are no real ports but the used ICMP Types. Just look in the man
page of ichains:
The source may include a port specification or ICMP
type. This can either be a service name, a port
number, a numeric ICMP type, or one of the ICMP
type names shown by the command
ipchains -h icmp Note that many of these ICMP names
refer to both a type and code, meaning that an ICMP
code after the -d flag is illegal. In the rest of
this paragraph, a port means either a port specifi-
cation or an ICMP type.
Quote:> Can someone point me to a reference on what these are? And tell me
> whether I should be concerned about them or not?
It is a ping, you most likely dont need to be concerned and you should read
the ipchains howto anyway.