Short: Because you cannot mix ( simply ) networks like that.
The netmask 255.255.255.0 is 24 bits long which limits you to 256 addresses, i.e. 254 machines, plus a broadcast address and a network address. I do not know the intimate details of the DHCP server you have there, but if you could persuade it to allow for a larger network, i.e. in your case, a 21 bit mask - 255.255.128.0 - then you could have your server on 192.168.1.201 and the rest of the dynamically assigned hosts on 192.168.5.x Be sure to allocate an appropriate broadcast address. It's usually the last, or highest numbered, address available in the network. It would help considerably if you could let us know exactly what the satellite modem is, and the URL of its documentation. Long: You need to read up on the details of IP network addressing and routing. Probably one of the best is the appropriate chapter in the RUTE book by Paul Sheer. http://rute.2038bug.com/node28.html.gz Note that the're gzip compressed files, and thus won't work with I.E., but are fine with Mozilla Firefox, and derivatives. Konqueror is ok too. Googling with the search term "rusty russell internet tutorial" will yield a number of good pages of advanced know-how, but imho Paul Sheer's prose is much easier to understand. 2008/10/5 David Lowe <[EMAIL PROTECTED]>: > Hello cluggers, hope someone can take 5 minutes to give me a hand... > > I've just installed a two-way satellite modem (because I live way out in the > styx and can't get anything else). It includes a DHCP server which I decided > to start using; previously everything was static. But I have one machine (my > MythTV server) that really needs to keep its static IP address. I have > worked out how to 'reserve' it's address on the DHCP server by specifying > it's MAC address. I'm not certain it works yet but that's not my problem... > > My problem is that the DHCP server hands out addresses in the range > 192.168.5.11/254. It's Ethernet interface is 192.168.5.100/255.255.255.0. > But I want to leave my server with a static address of 192.168.1.201 (its > easier to leave it alone rather than have to shag around with mySQL issues). > The result is that the server disappears off the network. I guess it's the > '5' in the IP address that's causing the problem... but from my limited > understanding, I thought internal address were internal and it should not > matter. > > I guess I can work around the problem by either reconfiguring (or disabling) > the DHCP server (but not sure if I might stuff anything else up) or the > server (don't really want to face the drama of changing the host of a MythTV > server) - so I thought I would ask first: why can't I mix IP addresses like > this? > > tia > > - David > > > > -- Sincerely etc. Christopher Sawtell
