[Opensim-users] Hosting OPENSIM behind a firewall

[Tedd Hansen]

Te short answer is that you can't.

You can not be on same LAN as OpenSim and at the same time allow remote access. This because of two reasons:
* First the IP reported would be your external IP, this is not necessarily a showstopper if your router is good.
* Second because the -REPLY- UDP packets from the OpenSim server would be sent directly to you, not via the router. (Because source IP is not set when replying UDP packets, so server chooses "best suited interface", which would be dropping it directly to LAN without sending it through NAT router back to you.)


Solution (you need an additional NAT router, like a wireless router or something): Set OpenSim server behind NAT inside your already NAT'ed network. Tell it to use official IP. Do all necessary port portforwarding on both NAT routers. And your external NAT router needs to support NAT'ing packets coming from LAN to its external interface in the same manner it would NAT external packets.


I hope you followed me on that one... ;)


Sincerely,
 Tedd

-----Opprinnelig melding-----
Fra: opensim-users-bounces at lists.berlios.de [mailto:opensim-users-bounces at lists.berlios.de] På vegne av Ursula MATOVA
Sendt: 14. oktober 2007 00:52
Til: opensim-users at lists.berlios.de
Emne: [Opensim-users] Hosting OPENSIM behind a firewall

Greetings All,

Well, I'm trying to get some informations and help to be able to run  
my own grid at home and to be able to share it with some of my friends.

The only documentation I found on internet is the following : http:// 
opensimulator.org/wiki/ 
OpenSim:Network_settings#Issues_with_NAT_and_Port_Forwarding

I have tried to set it up a few weeks ago, without success ...

Could somebody point me to some more "howto" or giving me some  
informations / tips ?

For your informations,

I'm running a 4x4 sims grid under windows ( for now, I'll move to  
linux asap ).

I'm using a home made firewall using NetBSD ( IPF / IPNAT ) and have  
my Own DNS Server for my internals servers ...

I also have a static external IP address, and I can manage the DNS  
entries for my domain name.

Any help will be very appreciated,

Many thanks in advance,

Regards,

Ursula.

(( Sorry about my english ... But sometimes, it's really bad ))
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