5:01 p.m.
have this strange intermittent issue, on two separate occasions, on the same box spanning
2 entire scratch rebuilds of this machine, I can not
ping a certain subnet, other than the router.
if I restart the network service on the computer having this problem, it all comes back
online. I can however during the whole time reach the
subnet and computers on it without a problem from any other machine.
Any thing?
-------------------------------------------
Chris McKeever
If you want to reply directly to me, please use cgmckeever--at--prupref---dot---com
http://www.prupref.com
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5:09 p.m.
McKeever Chris wrote:
have this strange intermittent issue, on two separate occasions, on
the same box spanning 2 entire scratch rebuilds of this machine, I can not
ping a certain subnet, other than the router.
if I restart the network service on the computer having this problem, it all comes back
online. I can however during the whole time reach the
subnet and computers on it without a problem from any other machine.
Have you tried swapping the NIC? When they go bad they can do odd things
like that. I'd especially suspect something like this if the machine's
network configuration is vanilla. Just a thought.
Peter
10:45 a.m.
On Fri, 12 Dec 2003 18:09 , Peter Eddy <petere(a)atg.com> sent:
McKeever Chris wrote:
> have this strange intermittent issue, on two separate occasions, on the same box
spanning 2 entire scratch rebuilds of this machine, I can
not
> ping a certain subnet, other than the router.
>
> if I restart the network service on the computer having this problem, it all comes
back online. I can however during the whole time reach
the
> subnet and computers on it without a problem from any other
machine.
Have you tried swapping the NIC? When they go bad they can do odd things
like that. I'd especially suspect something like this if the machine's
network configuration is vanilla. Just a thought.
the Nic is integrated, which doesnt matter for i can put another one in, but no I
haven't. I was thinking about this as well, but wanted to get
some feedback on it. it is just strange that it looses the same subnet..but yeah, it
could be a flakey card.
On Fri, 12 Dec 2003 17:11 , Luis Roberto <lrbasurto(a)aps.com.mx> sent:
do you route this by the same ethX?
ej. route 192.168.0.20 netmask 255.255.255.0 eth0
could be the NETMASK 255.255
the netmask allou you to seek in 2 difernts subnets
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router-1201.pru 0.0.0.0 UG 0 0 0 eth0
When/if this happens again, is there anything that I should run/check to maybe pinpoint
what is going on?
Thanks
-------------------------------------------
Chris McKeever
If you want to reply directly to me, please use cgmckeever--at--prupref---dot---com
http://www.prupref.com
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11:27 a.m.
McKeever Chris wrote:
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router-1201.pru 0.0.0.0 UG 0 0 0 eth0
yeah, pretty hard to go wrong with that, assuming your router routes to
the subnet in question.
When/if this happens again, is there anything that I should run/check to maybe pinpoint
what is going on?
You might try pinging the machine in question from a machine on the
unreachable subnet. Other than that, I don't know. I guess you could run
'arp' to see if there are any machines on that subnet in the cache, and
check /var/log/messages for anything interesting.
One more thing, have you tried replacing the ethernet cable or using a
different port on the hub?
Peter
7:09 a.m.
The nic are very cheap $5 usd in generic like via or rtlink also check your
master browser
smbclient -L localhost
pasword: <enter>
it shows you all the samba servers .and. the masters if you don't have one
with a high os level (default 30) you may have problems maping the net.
in /etc/smb.conf in the master browser you can look for os level an change
to 60 then that samba server is going to be the master
the change takes a few minuts
Luis Roberto
-------Mensaje original-------
De: fedora-list(a)redhat.com
Fecha: 13/12/2003 10:46:22 a.m.
Para: fedora-list(a)redhat.com; Peter Eddy
Asunto: Re: Loosing Connection To subnet
On Fri, 12 Dec 2003 18:09 , Peter Eddy <petere(a)atg.com> sent:
McKeever Chris wrote:
> have this strange intermittent issue, on two separate occasions, on the
same
box spanning 2 entire scratch rebuilds of this machine, I can
not
> ping a certain subnet, other than the router.
>
> if I restart the network service on the computer having this problem, it
all
comes back online. I can however during the whole time reach
the
> subnet and computers on it without a problem from any other
machine.
Have you tried swapping the NIC? When they go bad they can do odd things
like that. I'd especially suspect something like this if the machine's
network configuration is vanilla. Just a thought.
the Nic is integrated, which doesnt matter for i can put another one in, but
no I haven't. I was thinking about this as well, but wanted to get
some feedback on it. it is just strange that it looses the same subnet..but
yeah, it could be a flakey card.
On Fri, 12 Dec 2003 17:11 , Luis Roberto <lrbasurto(a)aps.com.mx> sent:
do you route this by the same ethX?
ej. route 192.168.0.20 netmask 255.255.255.0 eth0
could be the NETMASK 255.255
the netmask allou you to seek in 2 difernts subnets
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router-1201.pru 0.0.0.0 UG 0 0 0 eth0
When/if this happens again, is there anything that I should run/check to
maybe pinpoint what is going on?
Thanks
-------------------------------------------
Chris McKeever
If you want to reply directly to me, please use
cgmckeever--at--prupref---dot---com
http://www.prupref.com
---- Prudential Preferred Properties www.prupref.com
--
fedora-list mailing list
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11:26 a.m.
# route
Kernel IP routing table
Destination Gateway Genmask F M R
Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router-1201.pru 0.0.0.0 UG 0 0 0 eth0
When/if this happens again, is there anything that I should
run/check to maybe pinpoint what is going on?
Thanks
-------------------------------------------
Chris McKeever
Chris,
Is this the routing table whether or not you are having a problem? If
so, I don't see a subnet entry that's immediately obvious. What are
addresses of the machines and networks in question? Sorry if I
missed this in an earlier message.
Regards, Mike Klinke
1:29 p.m.
Em Sáb, 2003-12-13 às 15:03, Luis Roberto escreveu:
The nic are very cheap $5 usd in generic like via or rtlink also
check your master browser
Avoid these VIA-based NICs. I work with hardware, those don't worth the
effort to open the computer case. I don't know the word for this in
english, but these don't last long. It... burns ? (in portuguese we say
"queima")
--
[]s
Alexandre Ganso
500 FOUR vermelha - Diretor Steel Goose Moto Group
2:37 a.m.
On Fri, 2003-12-12 at 15:01, McKeever Chris wrote:
have this strange intermittent issue, on two separate occasions, on
the same box spanning 2 entire scratch rebuilds of this machine, I can not
ping a certain subnet, other than the router.
if I restart the network service on the computer having this problem, it all comes back
online. I can however during the whole time reach the
subnet and computers on it without a problem from any other machine.
Any thing?
what nic and driver is in use? I have a very similar intermittent
problems. The nic looks like it's up and running, but it isn't sending
anything. Tried changing cable and hub port and this didn't work.
Tried reinstalling the driver, tried a different kernel. Installed the
latest kernel and so far hasn't displayed this yet (since yesterday). I
can service network restart and this usually fixes it (for a period of
time). It drives me crazy!
3:50 a.m.
On Sun, 14 Dec 2003 00:37:14 -0800
Patrick Nelson <pnelson(a)neatech.com> wrote:
On Fri, 2003-12-12 at 15:01, McKeever Chris wrote:
> have this strange intermittent issue, on two separate occasions, on
> the same box spanning 2 entire scratch rebuilds of this machine, I
> can not ping a certain subnet, other than the router.
>
> if I restart the network service on the computer having this
> problem, it all comes back online. I can however during the whole
> time reach the subnet and computers on it without a problem from any
> other machine.
>
> Any thing?
what nic and driver is in use? I have a very similar intermittent
problems. The nic looks like it's up and running, but it isn't
sending anything. Tried changing cable and hub port and this didn't
work. Tried reinstalling the driver, tried a different kernel.
Installed the latest kernel and so far hasn't displayed this yet
(since yesterday). I can service network restart and this usually
fixes it (for a period of time). It drives me crazy!
I had a Linksys that used to do that to me. It didn't do it on all
machines. And it didn't even do it on all installs on the machines it
had that behavior with. I finally trashed it and bought a 3COM that
worked great.
--
Whip me. Beat me. Windows ME(tm).
7:33 a.m.
On Sun, 14 Dec 2003, Patrick Nelson wrote:
On Fri, 2003-12-12 at 15:01, McKeever Chris wrote:
> have this strange intermittent issue, on two separate
> occasions, on the same box spanning 2 entire scratch rebuilds
> of this machine, I can not ping a certain subnet, other than
> the router.
...
> if I restart the network service on the computer having this
> problem, it all comes back online. I can however during the
> whole time reach the subnet and computers on it without a
> problem from any other machine.
...
what nic and driver is in use? I have a very similar intermittent
problems. The nic looks like it's up and running, but it isn't sending
anything.
....
time). It drives me crazy!
Is there one or more routing daemons active (can only be one)?
(zebra, routed, ripd, ospfd, ipx_route radvd, rdisc)
There was a recent update to zebra... hmmmm.
If one daemon, how is it configured?
Is there a default router that you are using, what is it and how
is it configured? A good default route and you do not want
or need a routing daemon. Host routes?
Double check broadcast addresses!
It is possible for initial gateway and routing info to be steped
on by a routing daemon that thinks it knows what is going on.
With bad routing protocol interaction, things work, get quiet and
stop working.
Default host names and addresses can be "corrected" some time
after you boot. If DNS/NIS data is wrong (mis matched) things
break after the service is established and cached values expire.
Check for unexpected broken hard/soft links on host files and
other network config files (hosts, ifcfg-eth0,resolv.conf, ...)
$ ls -li /etc/hosts /etc/sysconfig/networking/profiles/default/hosts
6734009 -rw-r--r-- 2 root root 2062 Dec 12 12:51 /etc/hosts
6734009 -rw-r--r-- 2 root root 2062 Dec 12 12:51
/etc/sysconfig/networking/profiles/default/hosts
# ls -li /etc/sysconfig/networking/devices/ifcfg-eth0
/etc/sysconfig/networking/profiles/default/ifcfg-eth0
3604564 -rwxr-xr-x 2 root root 173 Nov 22 18:40
/etc/sysconfig/networking/devices/ifcfg-eth0
3604564 -rwxr-xr-x 2 root root 173 Nov 22 18:40
/etc/sysconfig/networking/profiles/default/ifcfg-eth0
Run arpwatch on a couple machines.
(some NICs work better/ differently in promiscuous mode ;-)
(arpwatch may tell you stuff of interest).
Snoop for routing packets with tethereal/ethereal or tcpdump.
Also, inspect packets that do not belong on the net.
Use traceroute/xtraceroute when things work and make sure that
they work as expected.
Some NIC setups can set MAC addresses that conflict if you copy
files about or swap hardware from box to box. In general one
should leave MAC addresses to factory set values. Ether switches
will hurl on MAC addr conflicts.
--
T o m M i t c h e l l
mitch48 -a*t- yahoo-dot-com
7:08 a.m.
do you route this by the same ethX?
ej. route 192.168.0.20 netmask 255.255.255.0 eth0
could be the NETMASK 255.255
the netmask allou you to seek in 2 difernts subnets
Luis Roberto
-------Mensaje original-------
De: fedora-list(a)redhat.com
Fecha: 12/12/2003 05:02:45 p.m.
Para: fedora-list(a)redhat.com
Asunto: Loosing Connection To subnet
have this strange intermittent issue, on two separate occasions, on the same
box spanning 2 entire scratch rebuilds of this machine, I can not
ping a certain subnet, other than the router.
if I restart the network service on the computer having this problem, it all
comes back online. I can however during the whole time reach the
subnet and computers on it without a problem from any other machine.
Any thing?
-------------------------------------------
Chris McKeever
If you want to reply directly to me, please use
cgmckeever--at--prupref---dot---com
http://www.prupref.com
---- Prudential Preferred Properties www.prupref.com
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10 comments
8 participants
participants (8)
-
Alexandre Strube -
Luis Roberto -
McKeever Chris -
Mike Klinke -
Patrick Nelson -
Peter Eddy -
Sinister Midget -
Tom Mitchell