bptestbpcd not showing expected results

Question

running NB 6.5.6, with a Solaris 10 master and Linux media servers. We recently had an issue communicating to several clients on a backup network.
The linux media server is connected to 4 networks, a "public" or management network, and 3 isolated backup networks. Netstat on the media server is as follows:
# netstat -rn
	Kernel IP routing table
	Destination&nbsp;&nbsp;&nbsp;&nbsp; Gateway&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Genmask&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Flags&nbsp;&nbsp; MSS Window&nbsp; irtt Iface
	10.10.10.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 255.255.254.0&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond0
	172.31.188.0&nbsp;&nbsp;&nbsp; 0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 255.255.252.0&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond1.550
	172.31.192.0&nbsp;&nbsp;&nbsp; 0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 255.255.252.0&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond1.551
	169.254.0.0&nbsp;&nbsp;&nbsp;&nbsp; 0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 255.255.0.0&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond1.551
	0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.254&nbsp;&nbsp;&nbsp; 0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UG&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond0
The client ip is 172.31.192.210.
Upon running the bptestbpcd command on to that linux client from the media server, I get:
# bptestbpcd -client 172.31.192.210
	1 1 1
	172.31.189.197:60892 -&gt; 172.31.192.210:13724
	172.31.189.197:50448 -&gt; 172.31.192.210:13724
	172.31.189.197:40525 -&gt; 172.31.192.210:13724
	&nbsp;
Why does it appear that NB is connecting to that client from the wrong NIC? Based on the routing table, it should communicate via the 172.31.192 ip address (which is 172.31.192.24).
&nbsp;

mph999 · Accepted Answer

However, it gets way more complex, and I'm not going to try and explain it, when we have perfectly good technotes ...
http://www.symantec.com/docs/HOWTO60779
As you will see, the network used is a combination of the order the network interfaces are detected when the system boots, and what the OS routing tables are.
You will also see that there is a PREFERRED_NETWORK setting also.
You may be aware of 'REQUIRED_INTERFACE' &nbsp;this should NOT be used if PREFERRED_NETWORK is available, and I think it is at 6.5.6
Martin
&nbsp;

mph999 · Answer

&nbsp;I could be wrong, but you have no gateway set ...
I would suggest the netstat -rn should look something like this
172.31.192.0&nbsp; &nbsp;&nbsp;172.31.192.24&nbsp; &nbsp; &nbsp; &nbsp;255.255.252.0&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bond1.550
&nbsp;
This is an excellent explnation and shows some example routing tables.
http://solaris-x86.org/documents/guides/routing.mhtml
What happens if you run a traceroute ?
Martin

revarooo · Answer

REQUIRED_INTERFACE is perfectly acceptable IF you want don't want your NetBackup traffic using other network interfaces AT ALL.
But I agree with mph999, if you are not to bothered and just need the backups done, PREFERRED_NETWORK is more suitable in that instance.

mph999 · Answer

.. true, but REQUIRED_NETWORK 'might' be dropped in future versions, so good idea to use PREFERRED which is more flexable.
M

lt2000 · Answer

Thanks for your replies.
I found that the REQUIRED_INTERFACE was being used to route the traffic via the 172.31.189.197 IP.
Doesn't look like PREFERRED_NETWORK is available under 6.5.
Subsequent to this post, I figured why we're seeing certain output from the bptestbpcd commands we've been issuing (REQUIRED_INTERFACE, some static routes)...except for one...
On a Solaris master, the routing table is as follows:
# netstat -rn
Routing Table: IPv4
	&nbsp; Destination&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Gateway&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Flags&nbsp; Ref&nbsp;&nbsp;&nbsp;&nbsp; Use&nbsp;&nbsp;&nbsp;&nbsp; Interface
	-------------------- -------------------- ----- ----- ---------- ---------
	default&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.254&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UG&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 170081
	10.10.10.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.23&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 33026 bge0
	10.10.10.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.22&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 nxge3
	10.10.10.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.28&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bge0:1
	10.10.10.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.27&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bge0:2
	172.31.188.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172.31.188.22&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 149283 bge550002:1
	172.31.188.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172.31.188.12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bge550002:2
	172.31.192.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172.31.192.15&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 43645 bge551002:1
	172.31.196.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172.31.191.251&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UG&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 45628
	224.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10.10.10.23&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; U&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 bge0
	127.0.0.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 127.0.0.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UH&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86&nbsp;&nbsp;&nbsp; 1294321 lo0
bptestbpcd to a host with IP: 172.31.192.210, yields the following:
# bptestbpcd -client athenu_bu
	1 1 1
	172.31.188.12:56501 -&gt; 172.31.192.210:13724
	172.31.188.12:56504 -&gt; 172.31.192.210:13724
	172.31.188.12:56507 -&gt; 172.31.192.210:13724
It would expect the connection to come from 172.31.192.15. I checked the bp.conf on the master, and there is no REQUIRED_INTERFACE line item.
Am I missing something? This one is killing me.

revarooo · Answer

The host you're running bptestbpcd from, what is the REQUIRED_INTERFACE set to?

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bptestbpcd not showing expected results

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