Re: Get interface IPV6 addresses

Den 27-02-2020 kl. 18:40 skrev Michael Wu:
> Dear Net-Snmp coders:
> 
> I am using net-snmp v5.8 with ipv6 enabled. Trying to get interface's 
> ipv6 addresses. I tried a couple of oids but could not figure out how to 
> map the ifindex to the ipv6 address assigned to the interfaces. All 
> interfaces have both ipv4 and ipv6 addresses assigned.

What OS is this? Is this your own compilation from the release tar ball 
or the versions provided by your distribution?

> 1. The ipv6AddrPrefixTable documented in 
> http://www.net-snmp.org/docs/mibs/ipv6MIB.html 
> <http://www.net-snmp.org/docs/mibs/ipv6MIB.html> was not available:
> 
> snmpwalk -v 2c -c public x.x.x.x .1.3.6.1.2.1.55.1.7
> IPV6-MIB::ipv6AddrPrefixTable = No Such Object available on this agent 
> at this OID

No, the IPV6-MIB has been deprecated in favor of the augmented IP-MIB 
(as used below)

> 2. ipAddressTable (1.3.6.1.2.1.4.34) has entries of ipv6 prefix:
> 
> snmpwalk -v 2c -c public x.x.x.x .1.3.6.1.2.1.4.34
> IP-MIB::ipAddressIfIndex.ipv4."243.0.3.129" = INTEGER: 230
> IP-MIB::ipAddressIfIndex.ipv6."fe:80:00:00:00:00:00:00:02:e0:ec:ff:fe:e1:5e:44" 
> = INTEGER: 230
> IP-MIB::ipAddressType.ipv4."243.0.3.129" = INTEGER: unicast(1)
> IP-MIB::ipAddressType.ipv6."fe:80:00:00:00:00:00:00:02:e0:ec:ff:fe:e1:5e:44" 
> = INTEGER: unicast(1)
> ...
> But I don't see ipAddressPrefix ( .1.3.6.1.2.1.4.34.5) from the output.

I do, with the CentOS 7 provided version (5.7.2), and with a somewhat 
recent installation of the 5-8-patches branch.

IP-MIB::ipAddressPrefix.ipv6."00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:01" 
= OID: 
IP-MIB::ipAddressPrefixOrigin.1.ipv6."00:00:00:00:00:00:00:00:00:00:00:00: 
                                          00:00:00:01".128
IP-MIB::ipAddressPrefix.ipv6."20:01:04:70:df:9a:00:00:00:00:00:00:00:00:00:01" 
=                                           OID: 
IP-MIB::ipAddressPrefixOrigin.2.ipv6."20:01:04:70:df:9a:00:00:00:00:00:00: 
                                          00:00:00:00".64
IP-MIB::ipAddressPrefix.ipv6."fe:80:00:00:00:00:00:00:de:98:3e:20:92:51:bd:11" 
=                                           OID: 
IP-MIB::ipAddressPrefixOrigin.2.ipv6."fe:80:00:00:00:00:00:00:00:00:00:00: 
                                          00:00:00:00".64


> 3. Also tried ipAdEntIfIndex ( 1.3.6.1.2.1.4.20.1.2)
> 
> snmpwalk -v 2c -c public x.x.x.x 1.3.6.1.2.1.4.20.1.2
> ...
> IP-MIB::ipAdEntIfIndex.243.0.3.129 = INTEGER: 230
> ...
> But it only has ipv4 addresses.

Yes, this is a IPv4 only table.

> What is the right approach to get the ipv6 address from the interface?

I would look at
IP-MIB::ipAddressIfIndex.ipv6."00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:01" 
= INTEGER: 1
IP-MIB::ipAddressIfIndex.ipv6."20:01:04:70:df:9a:00:00:00:00:00:00:00:00:00:01" 
= INTEGER: 2

/Niels

PS: Sorry about the line wrap of these extreme OIDs :-(

-- 
<https://www.e-julemaerket.dk/?f78133c1-061f-4320-b728-d1dbbf6996c7>



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