snmpget returns Unknown host

Discussion:

Reza Salehi

2007-08-30 22:00:58 UTC

Hi All,

I am having problem with snmpget or set on query from local host.
When I type : snmpget -d -v 2c -c TC localhost sysUpTime
snmpget : Unknown host

But if I use the real IP address of machine it will work:

snmpget -v 2c -c TC 192.168.0.12 sysUpTime
SNMPv2-MIB::sysUpTime.0=................09:01

I appreciate it if someone can help me with that.

Regards,
Reza

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Mike Ayers

2007-08-31 18:16:57 UTC

Permalink

Behalf Of Reza Salehi
Sent: Thursday, August 30, 2007 3:01 PM
I am having problem with snmpget or set on query from local host.
When I type : snmpget -d -v 2c -c TC localhost sysUpTime
snmpget : Unknown host
snmpget -v 2c -c TC 192.168.0.12 sysUpTime
SNMPv2-MIB::sysUpTime.0=................09:01

Most likely, you don't have "localhost" defined in your hosts file. Try getting from "127.0.0.1" instead of "localhost".

HTH,

Mike

Reza Salehi

2007-08-31 18:31:46 UTC

Permalink

Thanks Mike for your response.

When I use 127.0.0.1 it works fine but I can also so do < ping localhost > and that works fine too.It seems snmpget doesn't like the localhost name.
Any suggestion in this matter would be appreciated.

Regards,
Reza

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Mike Ayers

2007-08-31 20:53:27 UTC

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Behalf Of Reza Salehi
When I use 127.0.0.1 it works fine but I can also so do <
ping localhost > and that works fine too.

I doubt that means anything, since I would expect ping to have the value of "localhost" compiled in.

It seems snmpget
doesn't like the localhost name.

Just look at your /etc/hosts file. If it doesn't define "localhost", you can't use it. Many current distros don't, for reasons I cannot fathom.

HTH,

Mike

Mike Ayers

2007-08-31 20:53:27 UTC

Permalink

Behalf Of Reza Salehi
When I use 127.0.0.1 it works fine but I can also so do <
ping localhost > and that works fine too.

I doubt that means anything, since I would expect ping to have the value of "localhost" compiled in.

It seems snmpget
doesn't like the localhost name.

Just look at your /etc/hosts file. If it doesn't define "localhost", you can't use it. Many current distros don't, for reasons I cannot fathom.

HTH,

Mike

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Mike Ayers

2007-08-31 18:16:57 UTC

Permalink

Most likely, you don't have "localhost" defined in your hosts file. Try getting from "127.0.0.1" instead of "localhost".

HTH,

Mike

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Reza Salehi

2007-08-31 23:43:03 UTC

Permalink

Thanks Mike.

The following line is in that file:

127.0.0.1 localhost.localhostdomain localhost

It seems it defined fine.Is there any other place that might be changed?

Regards,
Reza

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Mike Ayers

2007-09-01 07:10:29 UTC

Permalink

Behalf Of Reza Salehi
Sent: Friday, August 31, 2007 4:43 PM
127.0.0.1 localhost.localhostdomain localhost

Next step is to look in /etc/nsswitch.conf. The "hosts:" line should have "files" in front.

Before that, you may want to try telnet to localhost just to see if it can resolve the name.

HTH,

Mike

Mike Ayers

2007-09-01 07:10:29 UTC

Permalink

Behalf Of Reza Salehi
Sent: Friday, August 31, 2007 4:43 PM
127.0.0.1 localhost.localhostdomain localhost

Next step is to look in /etc/nsswitch.conf. The "hosts:" line should have "files" in front.

Before that, you may want to try telnet to localhost just to see if it can resolve the name.

HTH,

Mike

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Reza Salehi

2007-09-04 21:24:05 UTC

Permalink

Mike,

I check that file and that line is there(hosts: files dns).
I also can do telnet localhost.

But still when I do "snmpget ....localhost ....." I get the Unknown Host error.

Any other suggestion?
I appreciate your help.

Regards,
Reza

Note: forwarded message attached.

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Mike Ayers

2007-09-04 22:08:13 UTC

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Behalf Of Reza Salehi
Sent: Tuesday, September 04, 2007 2:24 PM
I check that file and that line is there(hosts: files dns).
I also can do telnet localhost.
But still when I do "snmpget ....localhost ....." I get
the Unknown Host error.
Any other suggestion?

Nope. You've got a major problem here - either net-snmp is miscompiled (or compiled for the wrong target), or your networking is misconfigured. I'd suggest calling your IT to have a look, and if they can't find a problem, you might want to build the latest net-snmp from scratch.

Sorry,

Mike

Mike Ayers

2007-09-04 22:08:13 UTC

Permalink

Reza Salehi

2007-09-04 22:36:41 UTC

Permalink

Mike,

The good thing is I can run the commands using 127.0.0.1 instead of localhost but As you mentioned I might need to rebuild again the net-snmp.

Thanks for your help.
Regards,
Reza

Note: forwarded message attached.

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