Re: Anybody Using IPv6?

"Carlos E. R." <robin_listas@es.invalid> wrote:

On 2025-05-21 08:05, Marc Haber wrote:

"Carlos E. R." <robin_listas@es.invalid> wrote:

On 2025-05-20 23:14, Marc Haber wrote:

"Carlos E. R." <robin_listas@es.invalid> wrote:

On 2025-05-20 19:43, Marc Haber wrote:

What does the IPv6 routing table of the system in question say?

>
I don't have a problem with the laptop currently. The problem was some
years ago, on several computers.
>
cer@Isengard:~> ip route
default via 192.168.1.1 dev eth0
192.168.0.0/16 dev eth0 proto kernel scope link src 192.168.1.16
cer@Isengard:~>

>
That is not the IPv6 routing table.

>
That is all there is.

 
The correct command is ip -6 route.
 
You don't have the most basic knowledge and still you feel yourself
qualified to judge about the protocol. That's Dunning-Kruger at work.

>
I don't have IPv6, I don't have to remember IPv6 related commands.
>
cer@Laicolasse:~> ip -6 route
fe80::/64 dev wlan0 proto kernel metric 1024 pref medium
cer@Laicolasse:~>

So there is, as expected, only a route for the link local network,
making any connection attempt to a non-local IPv6 address error out
immediately, and a well-behaved application will immediately retry the
next address for the target host. That costs time, but like half a
millisecond or so. You will only notice that in high performance
networking. Your shell prompt wastes more CPU cycles every time it
gets displayed.

On a slow machine, about a millisecond, yes. That matters in high
performance computing, where professionals do the administration. It
does absolutely not matter on a personal workstation that spends 99 %
of its CPU cycles waiting for keystrokes anyway.

>
It is the network speed that matters, which is much slower.

 
There is zero evidence about IPv6 network speed being slower than IPv4
on a feature-par network.

>
That is not what happened, and not what I said.

What did you say?

Greetings
Marc
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