Re: [GnomeMeeting-list] Question related to GM,NM, OpenMCU

[Bruno Hertz <brrhtz yahoo de>]

On Wed, 2004-12-08 at 19:20 +0100, Damien Sandras wrote:

> That behavior *only* happens when there is a local firewall, all the
> symptoms described by Ashutosh lead to think there is a local firewall.
> The fact he can not telnet to the port NM is listening too confirms that
> behavior, so let's not mix different problems and draw wrong
> conclusions.
> 

You sure? On my linux box:

 # iptables -n --list
 Chain INPUT (policy ACCEPT)
 target     prot opt source               destination         
 Chain FORWARD (policy ACCEPT)
 target     prot opt source               destination        
 Chain OUTPUT (policy ACCEPT)
 target     prot opt source               destination 

On my Windows box I don't have a firewall installed, but out of
curiosity I nmap'ed that box:

 # nmap -p 1- -sT 192.168.0.10
 Interesting ports on 192.168.0.10:
 (The 65531 ports scanned but not shown below are in state: closed)
 PORT     STATE SERVICE
 139/tcp  open  netbios-ssn
 1503/tcp open  imtc-mcs
 1720/tcp open  H.323/Q.931
 5000/tcp open  UPnP
 MAC Address: 00:00:39:3F:80:9E (Toshiba)

 # nmap -p 1- -sU 192.168.0.10
 Interesting ports on 192.168.0.10:
 (The 65526 ports scanned but not shown below are in state: closed)
 PORT      STATE         SERVICE
 137/udp   open|filtered netbios-ns
 138/udp   open|filtered netbios-dgm
 1900/udp  open|filtered UPnP
 5002/udp  open|filtered rfe
 5003/udp  open|filtered filemaker
 49606/udp open|filtered unknown
 49607/udp open|filtered unknown
 49608/udp open|filtered unknown
 49609/udp open|filtered unknown
 MAC Address: 00:00:39:3F:80:9E (Toshiba)

So the ports are either closed (an according ICMP response was sent
to the challenge) or open (nmap says open|filtered on UDP ports
because on open ports it doesn't get neither an ICMP nor an UDP
response, so it can't actually distinguish open resp. filtered - 
but those ports are obviously open).

OK, those closed ports could still be filtered, but since I didn't
install any firewall on the WindowsME box I'm still thinking that
my hanging nm->gm calls have a different reason.