[squid-users] Is there an option to completely disable IPV4 outgoing address for Squid

[Amos Jeffries]

On 20/02/20 5:43 pm, Ahmad Alzaeem wrote:
> Hello Amos ,
> You are correct , but are plan is using IPV6 as possible .
> As I said the IPV6 of dual stack as like 98 % IPV6 . 
> 
> My question is how squid or under which circumstances can go to IPV4 as long as IPV6 dual stack exist ? How come it used 98 % for FB  IPV6 destinations as an example and 2 % FB IPV4 destinations .
> 


Could be any number of reasons.
 - the IPv6 pipe on your network being full making the IPv4 routes
faster sometimes.
 - other transient routing issues causing connection failures when IPv6
was tried, Squid falling back to IPv4 which worked.
 - DNS resolver failing to supply AAAA fast enough so Squid uses A
result for some connections.

... or a mix of all reasons.


> Is it random process or DNS answers type ?

DNS answers using "Happy Eyeballs" algorithms. With AAAA results
preferred over tried before A results when both are available.


>  Also Have not found squid directives for this area .
> 
> 
> Is there an option to tell squid use AAAA DNS reply from DNS for certain websites always or even with certain squid process  ? And others non Dual stack use default case ?
> 

The BCP specifications require both to be supported with a preference
towards IPv6 whenever possible. That is what Squid does. We only provide
the --disable-ipv6 and dns_v4_first for networks with seriously broken
IPv6 setups, and both already deprecated.


Amos