[squid-users] squid5 Happy Eyeballs - Is it possible to enable IPV4 only or IPV6 only ?

[Alex Rousskov]

On 5/1/22 23:49, Ahmad Alzaeem wrote:

> sometime the IPV4 
> instance receive DNS resolution of the destination as IPV6 and the 
> connection fails !!
> 
> sometimes the IPV4 instance receive the DNS resolution of the 
> destination as IPV6 and the connection fail .
> 
> Is there any option we can do based on the environment above ?


Without Squid code modifications, your options are:

* Use a custom DNS resolver (configuration) that never sends IPv4 
address records to an IPv6-only Squid. Use a custom DNS resolver 
(configuration) that never sends IPv6 address records to an IPv4-only 
Squid. Configure each Squid to use the right resolver (see dns_nameservers).

* Disable IPv6 support in IPv4-only Squid at ./configure time. This does 
not help with the IPv6-only Squid and has other negative side effects. I 
do not recommend this option.


 > Like maybe we disable eyeballs or preserving it while add an option
 > like DNS A records or DNS AAAA records .

It would be possible to enhance Squid by adding a configuration option 
that disables (certain) A or AAAA queries, but proper modifications are 
not trivial and nobody has done them yet: 
https://wiki.squid-cache.org/SquidFaq/AboutSquid#How_to_add_a_new_Squid_feature.2C_enhance.2C_of_fix_something.3F


Cheers,

Alex.