[asterisk-bugs] [JIRA] (ASTERISK-23767) Dynamic IAX2 registration stops trying if ever not able to resolve

[David Herselman (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-23767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=218376#comment-218376 ] 

David Herselman commented on ASTERISK-23767:
--------------------------------------------

dnsmgr can be used to work around this issue but that also has it's own issue of setting the port as '0' once the name can again be resolved. This is however another separate issue from the one reported here...

is: This bug report deals with the issue that, should Asterisk ever not be able to resolve a DNS hostname for an IAX2 registration, it never tries again.

> Dynamic IAX2 registration stops trying if ever not able to resolve
> ------------------------------------------------------------------
>
>                 Key: ASTERISK-23767
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23767
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_iax2
>    Affects Versions: 11.9.0
>         Environment: IAX2 registration to dynamic hostname
>            Reporter: David Herselman
>            Assignee: Rusty Newton
>
> Upgraded Asterisk from 10.7.1 to 11.9.0 on 55 hosts and are now experiencing an issue relating to IAX2 registrations, when the remote host is utilising a dynamic hostname.
> Alpha and Omega register with each other using IAX2 trunks. Both sides are set as 'host=dynamic' and rely on registrations to ascertain the remote point's IP address. This has been extremely reliable prior to our upgrade to 11.9.0.
>  
>  
> Problem: If DNS resolution is ever unavailable (Telco here kicks ADSL sessions off after 24 hours so that they reconnect) the registration gets set with a '(null)' host address and never retries the registration. Issuing a 'iax2 reload' doesn't help either, only completely unloading and reloading the chan_iax2 module works.
>  
> Alpha has the following iax registration:
> {noformat}
> register=Alpha:*******@sip.crffac.golden-era.co.za{noformat}
>  
>  
> Alpha shows the host for the registration as being '(null)' although DNS resolution is currently operational (interruption was 6+ hours ago):
> {noformat}
> alpha*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> (null)                N       Alpha       <Unregistered>             60  Unregistered
> 1 IAX2 registrations.
> alpha*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Omega/Alpha      165.145.109.36  (D)  255.255.255.255  4569 (T)      OK (27 ms)
> 1 iax2 peers [1 online, 0 offline, 0 unmonitored]
> {noformat}
> Omega correctly shows the Alpha peer as being unavailable, as it hasn't registered:
> {noformat}
> omega*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 196.15.196.130:4569   N       Omega       165.145.109.36:4569        60  Registered
> 1 IAX2 registrations.
> omega*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Alpha/Omega      (null)          (D)  255.255.255.255  0    (T)      UNKNOWN
> 1 iax2 peers [0 online, 1 offline, 0 unmonitored]
> {noformat}
>  
>  
> Issuing a 'reload iax2' does absolutely nothing, only completely unloading the chan_iax2 module and reloading it restores operation:
> {noformat}
> alpha*CLI> module unload chan_iax2.so
> Unloaded chan_iax2.so
> alpha*CLI> module load chan_iax2.so
> Loaded chan_iax2.so
> alpha*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 165.145.109.36:4569   Y       Alpha       196.15.196.130:4569        60  Registered
> 1 IAX2 registrations.
> omega*CLI> iax2 show peers
> Name/Username    Host                 Mask             Port          Status      Description
> Alpha/Omega      196.15.196.130  (D)  255.255.255.255  4569 (T)      OK (27 ms)
> 1 iax2 peers [1 online, 0 offline, 0 unmonitored]
> {noformat}



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