Re: A common problem with SLAAC in "renumbering" scenarios

[Mikael Abrahamsson <[e-mail]>]

On Wed, 20 Feb 2019, Lorenzo Colitti wrote:

> That doesn't really make sense on a mobile platform. When you switch 
> from wifi to cell data, you probably don't want to keep that connection 
> alive until that specific wifi network comes back. Instead you want to 
> give the app an error as soon as possible so it can retry the failed 
> connection on the new network. On Android, TCP connections are closed 
> the instant their IP address goes away. I don't know what iOS does.

I contacted linux-netdev about this, and I got no sympathy to close down 
the sessions if the addresses were gone. "Oh, the addresses might come 
back". Even when I said I'd like to be able to have this as a setting to 
close down the sessions, that I knew it won't come back I kept getting 
""how do you know?"

How do you close them in Android? Did you write your own userspace code to 
find sockets bound to addresses that were no longer available and close 
them down?

-- 
Mikael Abrahamsson    email: [e-mail]