[Users] problem with snmpd on veth

[Kirill Korotaev]

is it VLAN or you just gave veth that name?
I guess snpmd tries to be too smart and assumes it is a VLAN... But maybe I'm wrong.


Alexander Prinsier wrote:
> I'm running snmpd/strace in the host.
> 
> ip a l lists the interface 'veth3003.0'.
> 
> Could this '.0' make a difference?
> 
> Alexander
> 
> Kirill Korotaev wrote:
>> this ioctl() return ifindex by device name.
>> where do you run this snpmd/strace? in host or in VE?
>> obviously, there is no veth3003 device found, so the error was returned.
>>
>> what 'ip a l' commands shows when this happens?
>>
>> Kirill
>>
>> Alexander Prinsier wrote:
>>> Hello,
>>>
>>> I'm seeing these error messages appear in my error log:
>>>
>>> Feb 10 14:37:04 h01 snmpd[18514]: ioctl 35123 returned -1
>>>
>>> I tried to get the cause of this error message:
>>>
>>> strace /usr/sbin/snmpd -Le -f -u snmp -I -smux -p /var/run/snmpd.pid
>>> 127.0.0.1 > /root/snmpd.log 2>&1
>>>
>>> I could find this in the strace.log:
>>>
>>> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 10
>>> ioctl(10, SIOCGIFINDEX, {ifr_name="eth0", ifr_index=6}) = 0
>>> close(10)                               = 0
>>> socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 10
>>> ioctl(10, SIOCGIFINDEX, {ifr_name="veth3003", ???}) = -1 ENODEV (No such
>>> device)
>>> write(2, "ioctl 35123 returned -1\n", 24ioctl 35123 returned -1
>>> ) = 24
>>> close(10)                               = 0
>>>
>>> veth3003 is associated with VE 3003, in which runs openvpn (don't think
>>> that's relevant though).
>>>
>>> Anyone knows what this ioctl is for, and why it fails for veth3003?
>>>
>>> Thanks,
>>>
>>> Alexander
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> 
>