Hi ya all
Our setup:
Central backup management server: 10.118.15.100 Windows 2008R2
Storage node: 10.118.15.75 Linux Red Hat 5 64bit
client: 192.168.149.20 Red Hat Linux 5 64bit
We are having issues with backup throug our Cisco firewalls. We our
clients with 2 simultanious client connection each. We have tried setting
keep alive to 5 minuts to ensure the connection from being reset/cut-off
by the firewall.
On our Linux client we add the following to client startup script
/etc/init.d/networker
NSR_KEEPALIVE_WAIT=300
export NSR_KEEPALIVE_WAIT
Upon starting the client backup we see
2 Connections from Client -> nsrmmd on Storage_Node
2 Connections from Mgmt Server -> nsrexecd on Client (port 7937)
1 Connection from Client -> nsrindexd on Mgmt Server
2 Connection from Client -> nsrd on Mgmt Server (port 8696)
After setting the NSR_KEEPALIVE_WAIT the top 3 is kept alive through the
firewall, we see the the idle time counter inside the Cisco firewall are
returned to zero each 5 minuts (300 Sec.) - as expected.
But it has no effect on the last 2 connection (nsrd on Mgmt Server (port
8696)) - these seem to ignore the keep-alive. And at som point the
connection is lost and the backup fails.
In the course of investigating we have tried to set the system-wide
tcp-keep-alive to 5 minuts also - via setting "net.ipv4.tcp_keepalive_time
= 300". When this is set the idle time counter inside the Cisco firewall
are returned to zero each 5 minuts for all connections, which is to be
expected. And then the backup is completed without problems.
The problem is - that we do not want to set a system-wide setting to fix a
problem with one application, as it affects other applications. Could you
inform us which setting or environment variable we need to set to get
Networker to do keepalive on the connection (Client -> nsrd on Mgmt Server
(port 8696)) ?
In the network / firewall guide, there is no other parameters to set.
We testet and after we set the system wide keep alive, all backups run
fine...
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Med venlig hilsen / Regards
Kenneth Larsen
System Konsulent
Steria A/S
Tonsbakken 16-18
2740 Skovlunde
Mobile: +45 2630 6261
email: kel AT steria DOT dk
www.steria.dk
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