Re: A PING - Connectivity Issue [7:13873]
Ray, I'm not sure what you mean when you state that if done that with a PC the interface would not work...Let's take it to mean that you would try to ping an address assigned to PC's network interface. Depends on what the interface is comprised of. E.g, Windows 9x, NT and 2k and Linux (hey, it's a PC operating system too! ) all allow you to create a hosts file and of course you always have the loopback and, if you're not using DHCP, the local host addresses. So if you've loaded a TCP/IP stack you can always ping those addresses. The fact that they're not physical interfaces or connected to one don't matter beans to IP (Layer 3, remember?), that's not for it to know or care about. Now, normally you'd have a NIC installed and the host address assigned to that so you also have Layers 2 and 1 functionality, but they're _not necessary for a ping to happen_. See what I'm driving at? I'm quite ignorant of Sun hardware, but I'll bet that le0 is a virtual interface (Solaris shells don't care about layer 1 either) representing some physical interface that may or may not be hooked up to an actual transmission medium. The fact is that an interface (physical or virtual) is configured with an address and it's active is enough for PING. Ray Smith wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Guys, I was putting a lab together and noticed something wierd. I configured my Sparc (Unix) station's Le0 interface with an IP address, brought it up and decided to play around with it a little. I noticed that I could ping the IP that I configured on the interface although it was disconnected from/plugged OUT of the hub. I asked one of the Unix guys at my job if this was strange and he said NO! He could not tell me why but only said that it will always be able to ping the IP address configured on the box despite the fact that it is not connected to a Hub. What I need to know guys is WHY. I am not just satisfied with the fact that it is suppose happen unless I can know WHY it happen. Any takers here? Thanks dude. Ray Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=14008t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A PING - Connectivity Issue [7:13873]
Maybe there are no keep-alives. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=14035t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A PING - Connectivity Issue [7:13873]
-Such is true, and from what I can tell you both are right. In my experience, a Win box will not respond to a ping if there is not layer1 connectivity, while a Solaris box will. Why?.. I don't know. Solaris seems to associate the interface with a name first and then with an IP, while Win is the other way around. Any protocol gurus there??, Priscilla, any input?? (aside: I read your book to pass my CCDA two years ago, still one of my favorites. I've got a crush on you don't ever change I will be your groupie if you want one xoxoxo) plus you are one of the best contributors to this list! I don't agree that the OS does not care about layer1, if you don't have a link on a windoze box, you will NOT be able to ping it locally NO HOW NO WAY see. Hmm... alright how many CCNA's does it take to change an IP address on a PC? Ten, one to do it and nine to bitch that it is not their a job, a MCSE should handle it. Long live the acronyms. -Patrick AADF,KDJC,KIE,KID,KMM, QWOD, KDIOE, LOD+I On Fri, 27 Jul 2001 18:04:38 -0400, Patricia Leeb-Hart wrote: Ray, I'm not sure what you mean when you state that if done that with a PC the interface would not work...Let's take it to mean that you would try to ping an address assigned to PC's network interface. Depends on what the interface is comprised of. E.g, Windows 9x, NT and 2k and Linux (hey, it's a PC operating system too! ) all allow you to create a hosts file and of course you always have the loopback and, if you're not using DHCP, the local host addresses. So if you've loaded a TCP/IP stack you can always ping those addresses. The fact that they're not physical interfaces or connected to one don't matter beans to IP (Layer 3, remember?), that's not for it to know or care about. Now, normally you'd have a NIC installed and the host address assigned to that so you also have Layers 2 and 1 functionality, but they're _not necessary for a ping to happen_. See what I'm driving at? I'm quite ignorant of Sun hardware, but I'll bet that le0 is a virtual interface (Solaris shells don't care about layer 1 either) representing some physical interface that may or may not be hooked up to an actual transmission medium. The fact is that an interface (physical or virtual) is configured with an address and it's active is enough for PING. Ray Smith wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Guys, I was putting a lab together and noticed something wierd. I configured my Sparc (Unix) station's Le0 interface with an IP address, brought it up and decided to play around with it a little. I noticed that I could ping the IP that I configured on the interface although it was disconnected from/plugged OUT of the hub. I asked one of the Unix guys at my job if this was strange and he said NO! He could not tell me why but only said that it will always be able to ping the IP address configured on the box despite the fact that it is not connected to a Hub. What I need to know guys is WHY. I am not just satisfied with the fact that it is suppose happen unless I can know WHY it happen. Any takers here? Thanks dude. Ray ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=14039t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
A PING - Connectivity Issue [7:13873]
Guys, I was putting a lab together and noticed something wierd. I configured my Sparc (Unix) station's Le0 interface with an IP address, brought it up and decided to play around with it a little. I noticed that I could ping the IP that I configured on the interface although it was disconnected from/plugged OUT of the hub. I asked one of the Unix guys at my job if this was strange and he said NO! He could not tell me why but only said that it will always be able to ping the IP address configured on the box despite the fact that it is not connected to a Hub. What I need to know guys is WHY. I am not just satisfied with the fact that it is suppose happen unless I can know WHY it happen. Any takers here? Thanks dude. Ray _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=13873t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A PING - Connectivity Issue [7:13873]
because your pinging your own interface Ray Smith wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Guys, I was putting a lab together and noticed something wierd. I configured my Sparc (Unix) station's Le0 interface with an IP address, brought it up and decided to play around with it a little. I noticed that I could ping the IP that I configured on the interface although it was disconnected from/plugged OUT of the hub. I asked one of the Unix guys at my job if this was strange and he said NO! He could not tell me why but only said that it will always be able to ping the IP address configured on the box despite the fact that it is not connected to a Hub. What I need to know guys is WHY. I am not just satisfied with the fact that it is suppose happen unless I can know WHY it happen. Any takers here? Thanks dude. Ray _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=13913t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A PING - Connectivity Issue [7:13873]
That could not be the 'WHY' it happens because if I had done that with a PC the interface would not work, so there must be something other than it merely able to ping because it is its own interface. Thanks man From: Patrick Bass Reply-To: Patrick Bass To: [EMAIL PROTECTED] Subject: Re: A PING - Connectivity Issue [7:13873] Date: Thu, 26 Jul 2001 18:27:58 -0400 because your pinging your own interface Ray Smith wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Guys, I was putting a lab together and noticed something wierd. I configured my Sparc (Unix) station's Le0 interface with an IP address, brought it up and decided to play around with it a little. I noticed that I could ping the IP that I configured on the interface although it was disconnected from/plugged OUT of the hub. I asked one of the Unix guys at my job if this was strange and he said NO! He could not tell me why but only said that it will always be able to ping the IP address configured on the box despite the fact that it is not connected to a Hub. What I need to know guys is WHY. I am not just satisfied with the fact that it is suppose happen unless I can know WHY it happen. Any takers here? Thanks dude. Ray _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=13918t=13873 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
