Glad to hear it was helpful. Mike K. ________________________________
From: Pedro M. S. Oliveira [mailto:[EMAIL PROTECTED] Sent: Mon 10/20/2008 06:35 To: efw-user@lists.sourceforge.net Subject: Re: [Efw-user] Entering correct subnet mask stops connection? Really nice explanation!! I'm an IT teacher myself and sometimes it's really hard to explain this to students... i think I'll use your mail... cheers Pedro On Friday 17 October 2008 18:08:21 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 > > > -- ---------------------------------------------------------------------------------------------------------- Pedro Oliveira IT Consultant Email: [EMAIL PROTECTED] URL: http://pedro.linux-geex.com Telefone: +351 96 5867227 ----------------------------------------------------------------------------------------------------------
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