Let me explain the whole 10.x.x.x thing for D-STAR. Icom created this to meet concerns of the Japanese postal service, to help mitigate the concerns of TCP/IP over D-STAR displacing the ISP monopoly. In D-STAR, the digital data mode transports Ethernet packets (and in turn TCP/IP) as a payload to D-STAR packets. Routing is done based on the D-STAR addresses which are call signs plus an optional "Terminal ID", essentially an 8 octet address. If you are using the Icom G2 (or V1) gateway software it talks to the Icom RP-2C controller over Ethernet using 172.16.0.x addresses. On the controller you can add up to 4 modules. A module can be a D-STAR voice repeater (2m, 70cm, 23cm) or D-STAR data access point (23cm 128kbps). In theory then you could have up to 4 D-STAR data access points (model RP-2D). As traffic from the RP-2D modules come into the gateway, it assumes it has a unique IP address in the 10.x.x.x range (assigned by a registration process), but routes according the D-STAR addresses. The IP addresses are registered to attempt avoidance of address collisions. So if I as 10.10.10.1 (K7VE) want to contact NN1XYZ (10.3.2.1), the gateway software sends the Ethernet packets from D-STAR address K7VE to D-STAR address NN1XYZ. The 10.x.x.x addresses are also NATed out to the Internet if the destination address is not in the 10.x.x.x range. None of this is used if you are only doing Digital Voice over D-STAR. Everything is routed by callsign and the voice packets do not encapsulate any TCP/IP or Ethernet content (well you could but it is not standard). Now the reality is G2 is closed and largely stagnant, it also runs on Centos 5.x which is losing update support, many data facilities have security concerns if you are hosting with them. The larger network is now running on ircDDB (ircddb.net) using ircddbgateway (see Yahoo! group by the same name). ircDDBGateway is Open Source and is pretty agnostic on Linux distributions as well as being available as a Windows application. ircDDBGateway supports the Icom controller as well as a variety of alternate controller options. I would strongly encourage any new D-STAR install to use ircDDBGateway (or another ircDDB based gateway). You don't have to use the Icom addressing scheme. The RP2C can be on a LAN address. Client stations of the RP2D (ID-1 radios) can then use LAN/DHCP addresses (including 44-net). -- ------------------------------ John D. Hays K7VE PO Box 1223, Edmonds, WA 98020-1223 <http://k7ve.org/blog> <http://twitter.com/#!/john_hays> <http://www.facebook.com/john.d.hays>