First of all, i know that this is not the best place to ask this quesiton, but it is the only place that can quickly come to mind... I have a customer who has a block of 62 ip addresses (206.206.162.130 -> 206.206.162.190 and one for network/brodcast). They are current expanding their network, and need around 30 more ip addresses. I went ahead and allocated them the following IP address pool (207.66.81.144 -> 207.66.81.174 with network/brodcast address.) I attempted to use the new address on a Apple Macintosh (PowerMac 6500/75) and it erturned an error message saying that the router was not on the subnet, and that it could not use the new address. I know I should remember how to fix that, but I am not sure what to do.... Any help or guidence would be greatly appreciated. Thank you very much. =-=-=-=-=-= -Kyle Donald Smith -Systems Administrator -Community Internet Access, Inc. -peaches@cia-g.com
I think, you can use virtual address (especially in Cisco, ip address ... secondary) for new network. For example, router has 206.206.162.190 as local network's ethernet port. If you want to use new address block at same network, you can assign 207.66.81.174 to same port's secondary. It's syntax is simple. If your cisco router port is e0, you can use this serial command as reference. router> ena Password: <-- enter enable password router# config inter e0 ip address 207.66.81.174 255.255.255.224 secondary exit exit router# wr It is simple. If the customer's network has one backbone, this method can handle their network as seperate two network. ;> And every computer set their subnet's router IP address for their gateway address. Is it clear? If you have problem with this, please e-mail me. ;> HyunSeog Ryu Kyle D. Smith wrote:
First of all, i know that this is not the best place to ask this quesiton, but it is the only place that can quickly come to mind...
I have a customer who has a block of 62 ip addresses (206.206.162.130 -> 206.206.162.190 and one for network/brodcast). They are current expanding their network, and need around 30 more ip addresses. I went ahead and allocated them the following IP address pool (207.66.81.144 -> 207.66.81.174 with network/brodcast address.) I attempted to use the new address on a Apple Macintosh (PowerMac 6500/75) and it erturned an error message saying that the router was not on the subnet, and that it could not use the new address. I know I should remember how to fix that, but I am not sure what to do.... Any help or guidence would be greatly appreciated. Thank you very much.
=-=-=-=-=-= -Kyle Donald Smith -Systems Administrator -Community Internet Access, Inc. -peaches@cia-g.com
On Wed, 16 Sep 1998, Kyle D. Smith wrote:
their network, and need around 30 more ip addresses. I went ahead and allocated them the following IP address pool (207.66.81.144 -> 207.66.81.174 with network/brodcast address.) I attempted to use the new address on a Apple Macintosh (PowerMac 6500/75) and it erturned an error
Are you trying to set up that IP address block as one subnet or two? That IP block would be two valid /28s (207.206.81.144/28 and 207.206.81.160/28), but it isn't a valid /27. hint: For a valid /27 (block of 32 IP addresses), the last octet of the network address needs to be a multiple of 32. -Steve -- Steve Gibbard WWNet System Administration +1 734 513-7707 x 2009 http://www.wwnet.net
You made a subnetting error. You've gotta break it on a boundry. When using /27 networks, it breaks up as follows: Network Broadcast a.b.c.0/27 .31 a.b.c.32/27 .63 a.b.c.64/27 .95 a.b.c.96/27 .127 a.b.c.128/27 .159 a.b.c.160/27 .191 a.b.c.192/27 .223 a.b.c.224/27 .255 Jeremiah On Wed, 16 Sep 1998, Kyle D. Smith wrote:
First of all, i know that this is not the best place to ask this quesiton, but it is the only place that can quickly come to mind...
I have a customer who has a block of 62 ip addresses (206.206.162.130 -> 206.206.162.190 and one for network/brodcast). They are current expanding their network, and need around 30 more ip addresses. I went ahead and allocated them the following IP address pool (207.66.81.144 -> 207.66.81.174 with network/brodcast address.) I attempted to use the new address on a Apple Macintosh (PowerMac 6500/75) and it erturned an error message saying that the router was not on the subnet, and that it could not use the new address. I know I should remember how to fix that, but I am not sure what to do.... Any help or guidence would be greatly appreciated. Thank you very much.
=-=-=-=-=-= -Kyle Donald Smith -Systems Administrator -Community Internet Access, Inc. -peaches@cia-g.com
Jeremiah Kristal Communications Network Services Manager ICon CMT Corporation jeremiah@iconnet.net 201-319-5764 x284 internal
At 9:42 PM -0600 9/16/98, Kyle D. Smith wrote:
First of all, i know that this is not the best place to ask this quesiton, but it is the only place that can quickly come to mind...
I have a customer who has a block of 62 ip addresses (206.206.162.130 -> 206.206.162.190 and one for network/brodcast). They are current expanding their network, and need around 30 more ip addresses. I went ahead and allocated them the following IP address pool (207.66.81.144 -> 207.66.81.174 with network/brodcast address.) I attempted to use the new address on a Apple Macintosh (PowerMac 6500/75) and it erturned an error message saying that the router was not on the subnet, and that it could not use the new address. I know I should remember how to fix that, but I am not sure what to do.... Any help or guidence would be greatly appreciated. Thank you very much.
For a quick reference, download ftp://ftp.isi.edu/in-notes/rfc1878.txt This will give you some templates for VLSM subnets. Here are some relevant sections: 255.255.255.192 4 nets N.N.N.0 N.N.N.1-62 N.N.N.63 2 bit Class C 62 N.N.N.64 N.N.N.65-126 N.N.N.127 10 bit Class B N.N.N.128 N.N.N.129-190 N.N.N.191 N.N.N.192 N.N.N.193-254 N.N.N.255 255.255.255.224 8 nets N.N.N.0 N.N.N.1-30 N.N.N.31 3 bit Class C 30 N.N.N.32 N.N.N.33-62 N.N.N.63 11 bit Class B N.N.N.64 N.N.N.65-94 N.N.N.95 N.N.N.96 N.N.N.97-126 N.N.N.127 N.N.N.128 N.N.N.129-158 N.N.N.159 N.N.N.160 N.N.N.161-190 N.N.N.191 N.N.N.192 N.N.N.193-222 N.N.N.223 N.N.N.224 N.N.N.225-254 N.N.N.255 As you see, the first block you assigned is fully in the third /26 range. The second block, starting with 144, is off somehow. I am a little unclear if you wanted to give them a /26 or /27 block. In addition, you need to make sure your router interface is visible on both subnets. I'm assuming your configuration is something like this: R1 | | ---------------------------- with the Macs addressed either in 206.206.162.130 or 207.66.81.144 The router interface needs to have an address in both subnets. On Cisco, this is a secondary address, while on Bay, it would be a multinet addresss. Strategically, encourage your customer to use DHCP address assignment. If he does this, you can create a single block on the DHCP server for his future address needs, and the workstations simply need to reboot to get new addresses. As a shameless commercial plug, I have a book on addressing coming out in November from Macmillan.
participants (5)
-
Howard C. Berkowitz -
HyunSeog Ryu -
Jeremiah Kristal -
Kyle D. Smith -
Steve Gibbard