> I want to start multiple instances of firebird on linux server (one on
> default port, one on port 3051). Any hints or ideas?

Yes.

Read the release notes of Firebird 1.5 :-)

Martijn Tonies
Database Workbench - tool for InterBase, Firebird, MySQL, Oracle & MS SQL
Server
Upscene Productions
http://www.upscene.com
My thoughts:
http://blog.upscene.com/martijn/
Database development questions? Check the forum!
http://www.databasedevelopmentforum.com