Re: [squid-users] distinguish between IPv4 and IPv6

[Walter H.]

Hello,


(a general solution not just squid)

Walter

On 11.01.2021 21:29, Eliezer Croitoru wrote:

I did something different, that prevents using the IPv6 of the tunnel device als source address;

The basic test would be something like:



if the wc -l gt 0 then try to use IPV6.







I can write a helper for this if required.

Eliezer

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Eliezer Croitoru

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*Sent:* Monday, January 11, 2021 10:10 PM

*Subject:* Re: [squid-users] distinguish between IPv4 and IPv6





Amos


-------- Original message --------
From: "Walter H."
Date: Tue, 12 Jan 2021, 03:19

    Hello,

    is there a way, that I can do something like

    if ( dst is IPv4 ) go direct
    if ( dst is IPv6 ) use parent proxy xxx

    The reason for my question, I'm using a IPv6-in-IPv4 tunnel,
    and it would make sense to forward all traffic going to IPv6 to squid
    running on tunnel end;

    Thanks,
    Walter

The detection of an IPV6 available DST can be determined by DNS and external ACL helper. It will “slow” down the first couple bytes of the connection but can be much more reliable then the basic “dst” acl. nslookup -type=aaaa www.squid-cache.org -timeout=10 |grep -v '#53'|grep Address:|wc -l I believe it’s pretty simple and the main issue is that if a service advertises unreachable IPV6 address. It can be either because of network misconfiguration or FW or misconfigured DNS. I have seen all of the above happen in production services in the last year. *From:* squid-users <squid-users-boun...@lists.squid-cache.org> *On Behalf Of *?Amos Jeffries? *To:* Walter H. <walte...@mathemainzel.info>; squid-users@lists.squid-cache.org The dst ACL type accepts the special value of "ipv4". You can use that and the "!" operator to split traffic. However, please be aware dst is not very reliable until *after* the outgoing connection has been created, and we are still finding some access checks that do not use it correctly. YMMV.

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