Re: TCP/IP Routing with Class B
I've got a new project and I need a refresher on TCP/IP to get it done. Can anybody help me with where I might find answers/documentation/sample solutions, etc. on the following: I have a company that wants to move to TCP/IP only. They need to connect to 3 locations and the Internet (4 routers). The Internet link has a firewall with Network Address Translation so we can use any addressing we want internally. We'd like to use a private class B address like 172.16.x.x internally for the entire operation, but working with Class B's makes me go fuzzy on my TCP/IP fundamentals. Networks in each location would be 172.16.1.0, 172.16.2.0, 172.16.3.0, and the Internet. My questions are: Not exactly. Such a numbering would imply that the three above networks exist on the *same* physical net. If they were class C networks then they would each be a different network. If you needed class B then your networks would be numbered something like 172.16.0.0, 172.17.0.0, 172.18.0.0. - What subnet mask(s) do we apply to the networks to get the routing to work? You don't really need a subnet mask to get it to work. Subnet masks are only needed when you subdivide a network. If you have no more than 255 hosts on each network, then choose 3 private class C networks, such as 192.168.0.0, 192.168.1.0, and 192.168.2.0. - With 4 routes to different subnets and the Internet, what routing entries do we need to enter in the routers and the workstations? Does a routing protocol come into the picture? You could use a routing protocol, but it isn't necessary. Absent of that though you will need to make manual route additions on all boxes, e.g. for machines in the 192.168.0.0 network, you'll need to add routes for the 192.168.1.0, 192.168.2.0 and internet. However, if for each network, one machine will be the gateway to the other internal networks *and* to the internet router, you can simply add a default route to each machine, ie. if on the 192.168.0.0 network, 192.168.0.1 is the gateway machine, then for all machines in the 192.168.0.0 network you simply need to do: route add -net default gw 192.168.0.1 And likewise on the other nets. -- Jens B. Jorgensen [EMAIL PROTECTED] -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
TCP/IP Routing with Class B
I've got a new project and I need a refresher on TCP/IP to get it done. Can anybody help me with where I might find answers/documentation/sample solutions, etc. on the following: I have a company that wants to move to TCP/IP only. They need to connect to 3 locations and the Internet (4 routers). The Internet link has a firewall with Network Address Translation so we can use any addressing we want internally. We'd like to use a private class B address like 172.16.x.x internally for the entire operation, but working with Class B's makes me go fuzzy on my TCP/IP fundamentals. Networks in each location would be 172.16.1.0, 172.16.2.0, 172.16.3.0, and the Internet. My questions are: - What subnet mask(s) do we apply to the networks to get the routing to work? - With 4 routes to different subnets and the Internet, what routing entries do we need to enter in the routers and the workstations? Does a routing protocol come into the picture? Any information to start me down the right path is appreciated. John Roesch IS Manager Sensormatic Video Products Division San Diego, CA USA -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Re: TCP/IP Routing with Class B
John Roesch wrote: :I have a company that wants to move to TCP/IP only. They need to connect :to 3 locations and the Internet (4 routers). The Internet link has a :firewall with Network Address Translation so we can use any addressing we :want internally. : :Networks in each location would be 172.16.1.0, 172.16.2.0, 172.16.3.0, :and the Internet. My questions are: : : - What subnet mask(s) do we apply to the networks to get the routing to :work? Well, you want to extend the network part of the IP address to cover three octets leaving 253 addresses (excluding 0 and 255) in each network - that'll give you a MASK 255.255.255.0 : - With 4 routes to different subnets and the Internet, what routing :entries do we need to enter in the routers and the workstations? Does a :routing protocol come into the picture? Static routes will do just fine, I'd say. You don't specify how the lans are connected to each other, but since you say you end up with 4 routers, I suspect that you want to do it like this: Internet/ISP ^ | V LAN A-- Company LAN -- LAN B (172.16.1.0) ^ (172.16.2.0) | V LAN C (172.16.3.0) In the LANs A, B, C you just need to set the default route to the respective router of the LAN - it'll take care of the rest. In the Company LAN, each Workstation and Router has to have static routes to LAN A, B, C via the respective Router. If you don't care about traffic, you don't even need the LAN routes on the Workstation as long as the default router knows where to send packets destined for the separate LANs. HTH, -- Thomas Baetzler, [EMAIL PROTECTED], [EMAIL PROTECTED] A HREF=http://www.fh-karlsruhe.de/~bath0011/Visit my Homepage!/A The cowards never came, and the weaklings died on the way - R.A.H. -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
