02-23-2009
strange network problem
system config. Red hat ES 5 . multiple network cards. front end and back end networks.
Problem:
Here is what I have diagnosed on linux 6 .....other machines on the network if you try to get there do not see linux 6, a ping results in “no route to host” message. However the system is running fine. I ran a ping from linux 6 outbound to linux 1 and it never lost a packet (84000) of them, but from linux 4 I could not get to linux 6. As soon as I pinged linux 4 from linux 6, all of a sudden linux 6 saw the machine and pings went through. So outbound from linux 6 there is no issue. I have never seen this in the 25 plus years I have been doing this, and I will continue to work on it to resolve the problem.
If anyone has any idea how to figure this one out I am open to suggestions.
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LEARN ABOUT CENTOS
networks
NETWORKS(5) Linux System Administration NETWORKS(5)
NAME
networks - network name information
DESCRIPTION
The file /etc/networks is a plain ASCII file that describes known DARPA networks and symbolic names for these networks. Each line repre-
sents a network and has the following structure:
name number aliases ...
where the fields are delimited by spaces or tabs. Empty lines are ignored. The hash character (#) indicates the start of a comment: this
character, and the remaining characters up to the end of the current line, are ignored by library functions that process the file.
The field descriptions are:
name The symbolic name for the network. Network names can contain any printable characters execept white-space characters or the comment
character.
number The official number for this network in numbers-and-dots notation (see inet(3)). The trailing ".0" (for the host component of the
network address) may be omitted.
aliases
Optional aliases for the network.
This file is read by the route(8) and netstat(8) utilities. Only Class A, B or C networks are supported, partitioned networks (i.e., net-
work/26 or network/28) are not supported by this facility.
FILES
/etc/networks
The networks definition file.
SEE ALSO
getnetbyaddr(3), getnetbyname(3), getnetent(3), netstat(8), route(8)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
/Linux 2008-09-04 NETWORKS(5)