Binding to specific IP

[rossmc]

I've done a search and looked around Google but have been unable to find anything so far.

I have Cacti configured on a server but I need it to work such that any SNMP requests from the Cacti server out to other devices will come from a different IP (not the eth0 IP but the IP on eth0:1).

Is there any way I can achieve this?


Thanks!

[gandalf]

Currently not available.
You may add a new Feature Request.
This has to be done for cmd.php AND spine
Reinhard

[Linegod]

I don't see how that would work. snmpget/walk/etc do not take an interface or subinterface option, so I don't see how the commands could be told to use a different interface.

This would be a network issue, and should be left at that level....

[gandalf]

That's not correct. From "man snmp.conf"

clientaddr [<transport-specifier>:]<transport-address>
specifies the source address to be used by command-line applications when sending SNMP requests.
See snmpcmd(1) for more information about the format of addresses.

This value is also used by snmpd when generating notifications.

So in fact it is possible to specify the source address (only as a global option, don't know how this will work if different targets are reachable on different interfaces).
Perhaps this solves already the initial problem, because it's outside cacti at all
Reinhard

[Linegod]

I still stand by the statement that the individual commands do not allow for this, so it can't be moved into Cacti....

[gandalf]

I still stand by the statement ... it can't be moved into Cacti....

Yep, didn't I say this? But it IS possible to direct ALL snmp* commands to use the specified interface. Still not sure, how spine will work. I bet it will NOT use the specified interface. But that's one for Larry
Reinhard

[Linegod]

Yep, didn't I say this? .... I bet it will NOT use the specified interface.

Guess you did....

I as well doubt spine will use the specified interface....

[sigey]

yes gandalf definitely you can define a source interface to as per snmpd.conf
a harder way maybe to use netfilter:iptables post-routing

[rony]

I think clarification is needed.

Utilities such as the ones Cacti can use:

snmpget
snmpwalk
snmpbulkget
snmpbulkwalk

These are the utilities of concern. I don't know the syntax, but I don't recall these paying much attention to a configuration file. And I know they will not pay attention to snmpd.conf. Maybe snmp.conf, but I'm uncertain.