Re: wget refuses IPv6 link local addresses as invalid

[Tim Rühsen]

Hey Moritz,

On 6/28/23 15:40, Moritz Wilhelmy wrote:
> Dear wget maintainers,
>
> I tried to connect to IPv6 link local address using both wget 1.20 as well as 
> 1.21.3.
> I've replaced the address by ... for privacy reasons but since IPv6LL addresses 
> are
> automatically assigned on modern operating systems you can easily try this at 
> home :)
>
> The correct way to specify an IPv6 link local URL is as follows,
> %25 being the url-encoded version of the percent sign:
> $ wget -O- 'http://[fe80::...%25br0]:9090/topology/status'
> http://[fe80::...%25br0]:9090/topology/status: Invalid IPv6 numeric address.
>
> The following (technically invalid but otherwise harmless) method of specifying 
> the zone
> identifier also isn't accepted by wget - curl does seem to accept it, though:
> $ wget -O- 'http://[fe80::...%br0]:9090/topology/status'
> http://[fe80::...%br0]:9090/topology/status: Invalid IPv6 numeric address.
>
> Link local addresses need a zone identifier to be valid, otherwise it isn't 
> clear which
> interface to bind to for sending the request since they're valid only in the 
> local network
> segment and not routed.
>
> As expected, if the zone identifier is omitted, wget fails as follows:
> $ wget -O- 'http://[fe80::...]:9090/topology/status'
> --2023-06-28 13:21:45--  http://[fe80::...]:9090/topology/status
> Connecting to [fe80::...]:9090... failed: Invalid argument.

Thanks for bringing this up.
Tbh, I wasn't even aware of the zone id :)

If I get it right, it specifies the network interface. Well, I have to 
read up on it anyways.

Did you try to use --bind-address ?

Regards, Tim

> Best regards,
>
> Moritz

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