netdev - Re: [PATCHv3 net-next 16/16] sctp: enable udp tunneling socks

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Date:   Thu, 15 Oct 2020 23:35:28 +0200
From:   Michael Tuexen <tuexen@...muenster.de>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gnault@...hat.com" <gnault@...hat.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCHv3 net-next 16/16] sctp: enable udp tunneling socks

> On 15. Oct 2020, at 23:23, David Laight <David.Laight@...LAB.COM> wrote:
> 
> From: Marcelo Ricardo Leitner
>> Sent: 15 October 2020 18:43
>> 
>> Actually..
>> 
>> On Tue, Oct 13, 2020 at 03:27:41PM +0800, Xin Long wrote:
>> ...
>>> Also add sysctl udp_port to allow changing the listening
>>> sock's port by users.
> 
> I've not read through this change...
> 
> But surely the UDP port (or ports) that you need to use
> will depend on the remote system's configuration.
The local encapsulation port can be system wide, the remote encapsulation port
is per remote address. See https://tools.ietf.org/html/rfc6951#section-5.1

Best regards
Michael
> 
> So they need to be a property of the socket, not a
> system-wide value.
> 
> I can easily imagine my M3UA code connecting to different
> network providers which have decided to use different
> UDP port numbers.
> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
> 


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