I'm a little confused by the questions, but I'll take this one at a time: "I know my network ID is 16 but and subnet is 28 bit so 255.255.255.240." Yes, your network ID is 88.255.199.16 from what I can tell. /28 = 11111111.11111111.11111111.11110000 = 255.255.255.240 What that mask tells us is that you have 16 values for your subnetwork. Let's look at a few of the subnetworks created by taking the class-A network 88.0.0.0/8 and using a Variable Length Subnet Mask to cut this very large network into smaller parts. If we assume that your datacenter was handed 88.255.199.0/24, they might choose to cut this into 16 other subnetworks. Those networks would be as follows: Network Useable Range Broadcast .0 .1-.14 .15 .16 .17-.30 .31 .32 .33-.46 .47 .48 .49-.62 .63 .64 .65-.78 .79 .80 .81-.95 .95 .96 ... I think that if you convert these numbers to their binary equivalents you'll get a fuller appreciation of the mathematic beauty that is subnetting. "But datacenter entered in their router 255.255.255.224 which is a larger network than mine (because of my settings are not correct) So is that why my 88.255.199.16 can responds ping requests?" Hmm... That mask is the same as yours, so I'm not certain what you're saying here. Yes, I can ping that IP too... it appears to be an Allied Telesis AT-9924T switch. Mike K.
________________________________ From: ozgurerdogan [mailto:[EMAIL PROTECTED] Sent: Sat 10/18/2008 08:38 To: efw-user@lists.sourceforge.net Subject: Re: [Efw-user] Entering correct subnet mask stops connection? Mike Knisely wrote: > > First, I'm happy to hear you're going through the Cisco Academy. I am a > graduate of that program and have been an instructor for that curriculum > at a local state college. I think that it is an excellent foundation no > matter what your IT focus is in the future and would encourage anyone in > the IT field to get the first semester book at a minimum. An IT knowledge > built on the OSI model (or even TCP/IP model) will do wonders for your > troubleshooting skills. > > Next, 16 is not a gateway... 16 in the last octet would be the network > number. Network number and Gateway are not the same thing. A gateway is > the IP address, from the useable pool of addresses, assigned to another > router in that network. All devices that have interfaces should have the > same first three octets and the last octet should be a value between (and > including) 17-30. Each interface should also have the subnet mask > 255.255.255.240. Assuming that the 28-bit mask is correct, anything other > than 255.255.255.240 for the mask is wrong... not saying it won't work, > but it's wrong. > > For a basic example, lets look at this in the good ol' 192.168.1.0 > 255.255.255.0 space, common to practically every home-class broadband > router available. When you unbox the thing, it is configured with an ip > address of 192.168.1.1 on it's LAN interface. You would then use that IP > address as your "gateway" setting on any internal device. 192.168.1.0 > (the network number) isn't typed as a setting anywhere, because it is a > mathematical result of "anding" an IP address and the mask. So, if your > PC is 192.168.1.10 on this network and your mask is 255.255.255.0 let's > "and" them. > > 192.168.1.10 = 11000000.10101000.00000001.00001010 > 255.255.255.0 = 11111111.11111111.11111111.00000000 > anding result = 11000000.10101000.00000001.00000000 > > So, we convert that back to decimal and we get 192.168.1.0... Our network > number! > > Your original post says that you entered .16 as the "gateway ip" in > Endian. That tells me that you have told Endian it needs to go to a > router at 88.255.199.16 to get to the Internet. Now that we know that 16 > is a network number and not a useable IP address on this network, we see > that it definitely is not the correct setting for this field. > > Whomever is giving your a connection to the outside world, probably the > same entity that told you to use this address space, should be able to > tell you which of your pool of addresses is the correct IP to use as your > gateway. > > Mike K. > > ________________________________ > > From: ozgurerdogan [mailto:[EMAIL PROTECTED] > Sent: Fri 10/17/2008 03:54 > To: efw-user@lists.sourceforge.net > Subject: Re: [Efw-user] Entering correct subnet mask stops connection? > > > > > Thats exatcly what I meant Mike Knisely. I am a CCNA student and I know > all > what you explained. So I have 16-31 and my netmask would be > 255.255.255.240 > and 16 is my gateway (network ID) and 31 is my broadcast ip and I use only > 17-30 ip inside network. > > I do not remember why I entered 31 as netmask but at the moment it is > running so. Maybe my datacenter did something in router so I can not enter > 240, I will call them today. But by entering 240, I think I am doing > correct > settings right? > > Thank you very much. > -- > View this message in context: > http://www.nabble.com/Entering-correct-subnet-mask-stops-connection--tp20015603p20028158.html > Sent from the efw-user mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the > world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Efw-user mailing list > Efw-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/efw-user > > > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the > world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Efw-user mailing list > Efw-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/efw-user > > Mike you are gergous, You simple summarize basic Cisco lessons of our class :) I am still at the begining of the course. I found my problem but still confuised a bit. I talked to datacenter and that said that entered different values in their router because I entered incorrect settings in endian. They say they maked my pool larger by in fact using large ip pool for me to get to internet. I know my network ID is 16 but and subnet is 28 bit so 255.255.255.240. But datacenter entered in their router 255.255.255.224 which is a larger network than mine (because of my settings are not correct) So is that why my 88.255.199.16 can responds ping requests ? Thanks a lot -- View this message in context: http://www.nabble.com/Entering-correct-subnet-mask-stops-connection--tp20015603p20046573.html Sent from the efw-user mailing list archive at Nabble.com. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Efw-user mailing list Efw-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/efw-user
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