Problems accessing DMZ from some ISPs but not others

[Ghislain Hachey <ghachey@gmail.com>]

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Hi,

I'm trying to setup IPFire on a small Alix board. It seems to work ok 
except I am experiencing a weird problem. My public facing servers are 
not always reachable. I run a small private data center in Vanuatu and 
when I try to access my public servers from a server I rent in the US it 
works fine. However, there are some ISP networks that can't reach my 
public servers. Even more weird, one of our ISPs in Vanuatu has parts of 
it that can reach my public servers and other parts of it (different 
subnets and path to destination) that can't. I read that MTU/MRU values 
can cause some weird, hard to troubleshoot problems. I do not experience 
this when I use my Vigor 3300 firewall/router. I really like IPFire and 
where it seems to be heading, but this is a show stopper. Unfortunately, 
I can't spend much time troubleshooting this problem properly as the 
services need to be available.

The image I used to do the installation was 
ipfire-2.13.1gb-ext4-scon.i586-full-core72.img.gz. It runs on the Alix 
alix2d3 <http://www.pcengines.ch/alix2d3.htm>.

Any ideas?

-- 
Ghislain Hachey
www.ghachey.info