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Date:   Sat, 9 May 2020 19:24:01 -0600
From:   David Ahern <>
To:     Maciej ┼╗enczykowski <>
Cc:     Ido Schimmel <>,
        "David S . Miller" <>,
        Linux Network Development Mailing List 
Subject: Re: [PATCH] net-icmp: make icmp{,v6} (ping) sockets available to all
 by default

On 5/9/20 3:35 PM, Maciej ┼╗enczykowski wrote:
> Do we have some sort of beginner's introduction to Linux VRF somewhere?
> What they are? How to use them?

Ido's response gave introductory commands which can also be found here:

This should answer most questions about more advanced topics:

Lately, I am putting blogs on for
recurring questions.

> Currently the concept simply doesn't fit into my mental model of networking...

network namespaces = device level separation and up
VRF = Layer 3 and up separation

> We've actually talked about maybe possibly using VRF's in Android (for
> our multi network support)...
> but no-one on our team has the faintest idea about how they work...
> (and there's rumours that they don't work with ipv6 link local)

Rumors are ugly. If in doubt, ask. LLA with VRF is a primary requirement
from the beginning.

With 5.3 and up, you can have IPv4 routes with IPv6 LLA gateways with
and without VRFs.

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