Shaul Karl wrote: > What do you mean by different subnet? What are the other options, why > he has to be shamed if this is not his setup and why would someone > choose the wrong setup?
IP addressing and routing is by subnet, as in subnet mask. If you AND the IP address (as a 32 bit unsigned bigendian number) with the subnetmask mask and the result is equal to the result of another address the IP address are assumed to be on the same subnet. Because of the daisy chain routing, each segment should be on a different subnet or the routing would be difficult. By convention, one of the IP address ranges allowed for networks not connected to the internet (unconnected networks) is 192.168.0.xx to 192.168.127.xx with a subnet mask of 255.255.255.0 which means that you can have 128 discrete networks (or subnets) of 256 ip address each. These are called class C networks. Class C networks have 256 addresses. You can split it anyway you want, like have one big network of 192,168.0.xx to 192.168.127.xx netmask 255.255.128.0.0, or hundreds of little ones such as 192.168.0.0-15 netmask 255.255.255.240. Note that the first and last address in each range are reserved so 15 IP allows you 13 nodes, 256 allows 254 nodes, etc. I used the 192.168.xx.yy range because they are well known and well documented. For example, in the real world let's say your company owns 192.168.128.xx. This is a class C network and therefore has 256 address which are yours and therefore requires a netmask of 255.255.255.0 when connected to the internet. However you can internally subnet your network such as using a netmask 255.255.255.240 and have each segment as: 192.168.128.0 (1-14) 192.168.128.16 (17-30) 192.168.128.32 (33-46) 192.168.128.48 (49-62) 192.168.128.64 (65-78) 192.168.128.80 (81-94) .. 192.168.128.240 (241-254) And route internaly as approriate, however your ISP would route to the whole network. > Do you mean that the short cable would extend the length of the > current cable but this would only be a side effect for the fact that the > short cable will undo the crossing effect of the current cable? Yes. > What is a "punch down" wall jack? Is it the the other option of a fasteners > using wall jack? "Punch down" refers to the type of connectors on the back. They are metal blades that cut through the insulation. Wires are placed on the blades and "punched down" into the connectors using a special tool called a punch down tool, but you can use a screwdriver. Punchdown wiring connectors are normally used by telephone companies, and you will see bezeq techs use them. There are several kinds, but the ones used here are made by a company called Krone in Sweden. Home Center in the Malcaha mall (Jerusalem) sells punch down ethernet jacks and occasionaly punch down telephone jacks. You can also get them and sometimes Tiawanese copies of the Krone tools at Kashayof, 5 King George, also in Jerusalem. Geoff. -- Geoffrey S. Mendelson [EMAIL PROTECTED] 972-54-608-069 Do sysadmins count networked sheep? ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
