Virtual network interface

Vít Ondruch vondruch at
Mon Nov 10 10:01:02 UTC 2014

Dne 8.11.2014 v 14:23 Björn Persson napsal(a):
> Tomasz Torcz wrote:
>> On Fri, Nov 07, 2014 at 03:37:53PM +0100, Björn Persson wrote:
>>> Vít Ondruch <vondruch at> wrote:
>>>> * I don't understand why my Xchat should loose connection, when I
>>>> am switching from ethernet to WiFi (and they are both available
>>>> during interim period).
>>> For this use case you want to run IRC over SCTP, so that you can keep
>>> the connection open when you change IP addresses. The best that can
>>> be done with TCP is to automatically reconnect from the new IP
>>> address when the old TCP connection breaks.
>>  Why different address?  If this the same machine, it would be much
>> easier
>> just to configure DHCP to give the same IPv4 for both wifi and wired
>> interface.
> That works only for the special case where you're moving around inside
> an office (or a geek's home) where the wired and wireless networks
> share an IP address range.

This would be good start from my POV. IP address should identify
machine, network interfaces are identified by their MAC addresses ...


> If you're moving between your home, your
> office, public hotspots, trains and whatnot, then there's no way you'll
> be able to keep the same IP address without workarounds like tunneling.
> (Well I suppose you could just use an LTE connection all the time, but
> Vít's question was about switching network connections.)
>>  IPv6 stateless configured addresses are problematic, of course.
> If you have DHCP then you can have DHCPv6 too. IPv6 has the potential
> to be less problematic than IPv4 because it doesn't need address
> translation. I just hope people aren't so accustomed to being crippled
> by address translation that they start translating IPv6 addresses
> everywhere by habit.

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