--- In firebird-support@yahoogroups.com, Danguelle Mickael <mickael.danguelle@...> wrote:

>
> Hello,
>
> hello,
>
> Is it possible to run multiple server DBMS with different versions of
> firebird on the same OS debian linux.
>
> I created plusieuirs directories in / opt/firebird21 and / opt/firebird25.
> Changing file firebird in the directory / etc / xinet.d / firebird.
>
> add in / etc / services, ports corresponding to the server firebird.
> pour utiliser une version de firebird sur un port differents par rapport
> a l' autre

Yes it should be possible with classic server
Here is another example with firebird 2.1 on ubuntu (based on debian)
http://www.gefoo.org/generalfoo/?p=110