How to get the preferred and valid lifetimes via pyroute2.IPDB?

[TheDiveO]

How do I retrieve the preferred and valid lifetimes of the IPv6 addresses of an IPv6 node? When pretty-printing the interfaces[''ipaddr'] element of an IPDB() instance, I only see the addresses and the Linux-specific address "prefix length" settings. I would like to retrieve the lifetimes associated with every IPv6 address that is assigned to a network interface for diagnosis. How to...?

Best regards,
TheDiveO

[Peter Saveliev]

IPDB currently doesn't store IFA_CACHEINFO — currently you can get this info via ipdb.nl.get_addr() interface or an IPRoute instance.

If you believe it would be useful to have that cached in IPDB, I can implement that as well.

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[TheDiveO]

Peter, thank you very much for your quick response! Getting cached access would help me with tracking IPv6 address changes without the need to regularly poll, avoiding unnecessary cpu load.

Since these lifetimes, the cached lifetimes should have a reference timestamp that indicates when the lifetimes were read and stored.

Best regards,
TheDiveO

PS, the RFCs constantly use the spelling "preferred" with two "r". From reading some sources of pyroute2 I noticed that the lib users "prefered".

[Peter Saveliev]

Ok, than the support will be done asap.

Thanks for the notice about «preferred» — that's a typo and will be fixed.

[TheDiveO]

Peter, thank you very much!

[Peter Saveliev]

In the master:

In [1]: from pyroute2 import IPDB
In [2]: ip = IPDB()
In [3]: ip.interfaces.wlp4s0.ipaddr[('fe80::7552:c31a:60c6:a427', 64)]['cacheinfo']
Out[3]:
{'cstamp': 35003367,
 'ifa_preferred': 4294967295,
 'ifa_valid': 4294967295,
 'tstamp': 35003472}

In [4]: ip.interfaces.wlp4s0.ipaddr['fe80::7552:c31a:60c6:a427/64']['cacheinfo']
Out[4]:
{'cstamp': 35003367,
 'ifa_preferred': 4294967295,
 'ifa_valid': 4294967295,
 'tstamp': 35003472}

2017-09-16 19:40 GMT+02:00 TheDiveO <harald....@gmx.net>:

Peter, thank you very much!

[TheDiveO]

Cool! Just installed from git and gave it a try, works like a charm. Peter, many, many thanks for adding this!

What is the difference between the cstamp and the tstamp?

Best regards,
TheDiveO

[Peter Saveliev]

> What is the difference between the cstamp and the tstamp?

cstamp — is the address creation timestamp

tstamp — meaningful for temporary addresses, but I didn't look deeply into the kernel code.

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