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Re: Squid not listening on IPv6 fe80:: link-local address

Hi Petter, hi Marco,

On  Mo 04 Apr 2022 19:19:20 CEST, Petter Reinholdtsen wrote:

[Marco Gabriel]
I couldn't find any hints that squid never binds to fe80:: addresses, so
I'm a bit stuck and don't know if this may be a bug or works as

My guess is that you need to specify the network interface using the %
notation, something like this:

  ping6 fe80::aaaa:bbbb:cccc:dddd%eth0

Or did Linux fix the addressing of link local addresses to no longer
need the interface included in the address?

nope, link-local IPv6 addresses are always related to a specific interface. This is btw. not at all Linux related, IMHO. (Or is it?)

The challenge is that fe80:: is always the link-local prefix, for all link-local networks/interfaces on the same host. So, sending packets to a link-local address always requires the outgoing network interface to be specified with the packet send request.



root@tjener:~# nmap -6 -p 3128 fe80::5054:ff:fef3:c9f%eth0
Starting Nmap 7.80 ( https://nmap.org ) at 2022-04-05 11:34 CEST
Nmap scan report for fe80::5054:ff:fef3:c9f
Host is up (0.00012s latency).

3128/tcp open  squid-http

Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds


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