Hi... Thank you for the reply and help but after much readings and testing around, I still find myself stuck with the project.
To answer your question, my project would start with emulation on GEO satellites first and then proceed to the more complicated MEO & LEO satellites. This means that issues such as handover between satellite is currently left untouched. I have read the "Linux netfilter Hacking HOWTO" and "Packet Filtering HOWTO" numerous times but still don't know how to start using the QUEUE target or the userspace. I have also read many documents scattered in the deep space of the internet but still in a very confused state. Sorry for being quite stupid here because i'm really new to LINUX and netfilter... :( You mentioned on your previous mail that there are some sample code on these. Can you point that out to me as i can't seem to find them... Thank you very much. Best regards, Wei Koong CHAI >> I am currently doing a project on "Satellite IP Network Emulator" >> whereby I have to setup a bridge and then through the bridge >> (emulator), I need to add satellite link elements (such as longer >> delay, diff. queue, higher BER etc. etc.) to the emulator to create a >> synthetic satellite environment. > > Is this for GEO satellites (constant delay), or for MEO / LEO (delay > varying with orbit location, needs orbit estimation)? > >> Here's the questions and doubts that I have:- >> >> [1] Is Netfilter suitable for my project? > > It certainly provides the tools you need: > >> [2] If yes, please give me some pointers on where and how should i >> start? (I am currently trying to digest all the documentations about >> Netfilter and iptables.) > > Have a look at the QUEUE target, i.e. the userlevel queueing component. > This lets you pass packets to a userlevel daemon, which can then queue > them for some time, and reinject them after the simulated delay. If I > remember correctly, there are sample userlevel daemons, which you would > then have to adapt to implement your delay logic. > > best regards > Patrick
