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My Masquerading system usually works fine but on occasion for an
undetermined reason will no longer
forward data. Generally, it works beautifully when browsing http, or with
news clients, but ftp has caused
it to stop transmitting data as well as when exchanging data with SAMBA.
When it stops one or both of
the NIC cards will no longer ping the network. This has happened both only
internally ( it won't ping a
client on 192.168.1.0/24 ), only externally ( will ping my network but not
the outside world ) or won't
ping either; I know the data isn't even "hitting the wire" because my hub,
which indicates data transmition,
doesn't light up when I ping but normally does when it's working properly. I
can ping both cards from
linux but can't ping them from the workstations.
I've tried. /etc/rc.d/init.d/network stop followed by
/etc/rc.d/init.d/network start, which doesn't correct
the problem. I've tried flushing all rules (ipchains -F ) and reapplying the
MASQ rules. I've checked that
the routing table was correct and I've used ifconfig to down both cards,
changed their ip addresses and
put the cards back up. Nothing will correct the problem except rebooting.
I use compac PCI network cards with the TLAN driver. I've replaced one of
the cards with the idea
that the card went bad, but the replacement card exhibits the same
behaviors.
Is there a problem with the driver for these cards or do the cards have
problems? Is there a way of
reseting the card without rebooting? Has anyone experienced similar
problems? Are there other
diagnostics I could try to determine where the problem lies? Does this sound
like the firewalling kernel is
stopping everything leaving the NIC?
Suggestions or direction, much appreciated.
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