[squid-users] How to definitively disable IPv6

[Troiano Alessio]

Hello,
I need to definitively solve the ipv6 (un)reachbility issue.
I state I read this topic: http://squid-web-proxy-cache.1019090.n4.nabble.com/dns-v4-first-on-ignored-td4658427.html but not found a solution. Amos wrote “Squid tests for IPv6 ability automatically by opening a socket on a private IP address, if that works the socket options are noted and used.”
Anyway I disable IPv6 on my Red Hat 7.4 with the following:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.bond0.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
Used the “dns_v4_first on” and also “tcp_outgoing_address 172.31.1.x all” on squid conf to force the use of IPv4.
Anyway squid try to connect to the IPv6 address instead of IPv4 and I’m not able to reach it:
C:\Users\atroiano>nslookup download.pdfforge.org
Server:  espevmdxxxx.xxxx.prv
Address:  172.x.x.x

Risposta da un server non autorevole:
Nome:    download.pdfforge.org
Addresses:  2001:4860:4802:38::15
          2001:4860:4802:34::15
          2001:4860:4802:32::15
          2001:4860:4802:36::15
          216.239.32.21
          216.239.38.21
          216.239.36.21
          216.239.34.21
[root at HUB-RM-PRX-03 ~]# tail -f /var/log/squid/rsa/access.log | grep pdfforge.org
%SQUID-4: 172.31.x.x 49444 [25/Jan/2019:11:02:58 +0100] "GET http://download.pdfforge.org/download/pdfcreator/PDFCreator-stable HTTP/1.1" download.pdfforge.org - - "/download/pdfcreator/PDFCreator-stable" 503 text/html 4545 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0" TCP_MISS:HIER_DIRECT 2001:4860:4802:38::15 80 0
Squid doesn’t try to connect to IPv4 addresses for this site and for many others.

What can I do?
My ISP is IPv4 only.

Thank you, Regards.

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