[SR-Users] IPv6 addresses in dispatcher on IPv4 only proxy

[Daniel-Constantin Mierla]

On 10/11/12 2:11 PM, Alex Hermann wrote:
> On Thursday 11 October 2012, Daniel-Constantin Mierla wrote:
>> On 10/11/12 12:00 PM, Alex Hermann wrote:
>>> On Thursday 11 October 2012, Daniel-Constantin Mierla wrote:
>>>> Do you get any other error/debug
>>>> message before that can give an hint why is failing?
>>> Unfortunately not.
>> Not even debug messages that could lead to failure point if running with
>> debug=3?
> Sorry, forgot about debug logs. Here they are:
>
> DEBUG: <core> [dns_cache.c:567]: dns_hash_find([IPv6 Address](30), 1), h=707
> DEBUG: <core> [resolve.c:727]: get_record: lookup([IPv6 Address], 1) failed
> DEBUG: <core> [dns_cache.c:895]: dns_cache_mk_bad_entry([IPv6 Address], 1, 60,
> 1)
> DEBUG: <core> [dns_cache.c:828]: dns_cache_add: adding [IPv6 Address](30) 1
> (flags=1) at 707
> ERROR: dispatcher [dispatch.c:325]: could not resolve [IPv6 Address]
> WARNING: <core> [mem/f_malloc.c:474]: WARNING:fm_free: free(0) called

looking at the code it seems to be ending in doing an A lookup instead 
of AAAA, a matter of dns_flags value that should be enabled for IPv6 if 
you set  dns_try_ipv6 global parameter. I couldn't spot where this would 
be disabled if no IPv6 listen socket is provided.

Maybe you can track it in the sources by adding some debug messages in 
the functions called from dispatcher module.

If you try the trick of adding one udp worker to listen on ::1, like:

socket_workers=1
listen=[::1]

Does it work?

Cheers,
Daniel

>
>> Is dns_try_ipv6 parameter set to yes in configuration file?
> I tried with and without it, same result.
>
>> Anyhow, the dns resolve is done for doing keepalives, if it is an ipv4
>> only, you will get some errors at runtime because there is no socket for
>> ipv6. Perhaps the fix would require some coding in dispatcher module. An
>> alternative is to use database views to make available only the groups
>> you want in this ipv4 instance.
> I'll see what i can do about it. Thanks
>

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