ethernet networking problem

Just to clearify some terms: IP: The adress of the host. Can be anything, but should be either a address range you own, or one of the private (192.168.0.0/255.255.0.0 or

10.0.0.0/255.0.0.0) Netmask: Netmask is included above. Think as the netmask as a filter. A ip is a 32 bit address, so is the netmask, so a mask of 255.255.255.0 filters out all, but the last bit. If the address your box is trying to reach for is outside the last part, it will go to the gateway. So the gateway is ONLY applied whenever you're trying to reach for something outside the scope of the netmask. To help, it'd be usefull if you said what IP range you used, and your netmask. Normally, you'll only ask for GW whenever you want to pass on to the internet. Typycailly, the GW is the DSL modem.

Btw, I hope you didnt buy new hubs...

--
MVH,
Vidar

www.bitsex.net

pls

it's ip addr range is 192.168.0.xxx subnet: 255.255.255.0

yesterday i did'nt open the dsl only the local are network. but today when i open the router and dsl modem, the other station immediately got default gateway in them and automatically connected to the internet. They all recognize each other now when viewed in the network neighborhood. i don't know tommorrow. what might be the reason? you know, i spent my day testing the utp cable betwen hubs and station using my tester and their is always continuity. no problem on cable. But it displays only itself on the network neighborhood. other stations are not displayed. therefore, it is not also recognized by other stations.What could be the solution to this problem.

by the way, i am a newbie. a first timer in managing a simple networking system.- sorry bout my questions but i appreciate greatly any ideas that come coz it helps me improved. thank you so much!!!

-- very simplified explanation -- When PC's with a network card are powered up, they try to get an IP address from the network. Failing that, newer operating systems provide a default IP address, such as 169.254.3.1 or 169.254.1.11 (or some other default that's set by the user or an admin). It's possible that some of your PC's are in one block of addresses (169.254.3.x) and some in another (169.254.1.x). The PC's in a given network block will see the other PC's in that block, but not the PC's in other address blocks.

When the PC's are connected to the router, they all get an IP address assigned by the DHCP server in the router. All the addresses will be in the same block, so all the PC's will see each other.

John (I also speak X.25)

i see. thanks. my next questions are, even if they are all connected to the same hub, it can happen that they will be in a different blocks of addresses? How can i make them on same block of address when the router is off because most of the time i turn off the router and dsl line but i want them to see each other eventhough the router is off. like this unit i am using. i can browse on the net but it cannot be seen by other computers.but its connected to the internet anyway... thanks in advance.

Hope that is not serious...Talks x25? Feel free...:D

--
MVH,
Vidar

www.bitsex.net

Sure, it can.

Use fixed IP's on your computers and turn off DHCP.

HTH, Mark Van Borm

yes I believe it's called subnetting but I might be wrong.

How can i make them on same block of address when the router

Normally you would set your network up so that all the PC get IP addresses from the router vis DHCP. If you want to turn the router on and off (why?) you could allocate each PC, the router and anything else (printer) static IPs in the range 192.168.0.x and all with the subnet mask 255.255.255.0

Yes, it is subnetting. You assign subnets via the netmask:

10.100.8./255.255.255.64 which means you could use from 10.100.8.1 to 10.100.8.63 (lowest and higest address goes away...) That'd be a 7-bit wide subnet, so it could be written 10.100.8.0/31. You can divide your net into any portion that is dividible by a power of two (i.e 2-4-8-16-32-64-128 leaving respectively 126-62-30-14-6-2-2 IP's availvable.) I seldomly see any reason for subnetting, unless you have more than a /24 bit (255.255.255.0) subnet, in which cases windows uses ages for discovering its network neighbourhood. If you have under 254 machines, I see no point in subnetting. For security, use VLANs.

Yes, and I suggest yo turn off dhcp in the modem/router if you turn it off. Enable a dhcp server somewhere else. Here is my dhcp setup: ddns-update-style none; default-lease-time 14400; option domain-name "vidarlo.net"; option domain-name-servers 10.0.0.10; option routers 10.0.0.10; subnet 10.0.0.0 netmask 255.255.255.0 { range 10.0.0.20 10.0.0.200; default-lease-time 14400; max-lease-time 172800; }

DHCP can be found on

--
MVH,
Vidar

www.bitsex.net

In the sense that I've been successful in implementing Cisco's XOT (X.25 over TCP/IP) and writing programs for available battery-backed PC's to run constant traffic over a test network (4 Telematics nodes). The test network ran and collected performance statistics for almost a year. X.25 isn't that common in the US (other than the modified BX.25 used by some telephone companies and specific sections of the US government), although it has seen much usage elsewhere in the world.

Network diagram:

John

tnx, because as a beginner, i just want to see my network stations to see each other even the router is off.( just discovering, learning). by the way, i can see the ip adresses of each computer when i type ipconfig. but i dont know how to view the ip address of the router. and also how to change its ip address. please give me the concept of operation of a router. thanks in advance!!!

Thank you. by the way how can i turn off the DCHP>

thnks in advance!!!

To configure the router you normally have to surf to a special web page built into the router itself. The instruction manual for the router will tell you how to do this.

same as above.

Skip the sections you know..

See the instruction manual for the router.