I use iftop (I love it) version 0.16. I seem to have some problem getting name resolution to work. I seems to some of the time and then it doesn't.
Could someone fill me in on what I should know that I don't?
David Susen General Manager - OnPerfect Communications Network, Inc. 207-794-9065 office das@onperfect.com ****************************** This e-mail message, including any attachment(s), is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged and/or confidential. You are hereby notified that any use, dissemination, distribution and/or reproduction of this message and or any attachment(s) by unintended recipients is unauthorized and may be unlawful. Thank you for your cooperation. OnPerfect Communications Network, Inc. http://www.onperfect.com
On Sun, Jul 18, 2004 at 09:48:19PM -0400, das@onperfect.com wrote:
I use iftop (I love it) version 0.16. I seem to have some problem getting name resolution to work. I seems to some of the time and then it doesn't.
Could someone fill me in on what I should know that I don't?
Can you tell us what platform you're on and what resolver option you are using?
Assuming you're using something other that netdb_1thread, iftop will attempt to resolve multiple addresses simultaneously, however it is possible that it will encounter a number of hosts for which the DNS servers are unavailable, in which case it will wait to time out on each of these hosts. If you encounter several of these at once, it will give the appearance of name resolution stopping.
Paul
Paul,
Well, I know it sounds old but we are using RedHat release 6.2 on this particular machine. It does the job when it comes to routing.
I have not asked my son (who does alot of re-compiling of the kernel for various purposes) but I wouldn't be surprised if the kernel is different than the standard Red-Hat 6.2 kernel.
This particular box is a router for our wireless network. I use it extensively to monitor traffic. It connects to our ISP.
Give me a clue where to look for "netdb_1thread" and I'll take a look.
David Susen General Manager - OnPerfect Communications Network, Inc.
Paul Warren writes:
On Sun, Jul 18, 2004 at 09:48:19PM -0400, das@onperfect.com wrote:
I use iftop (I love it) version 0.16. I seem to have some problem getting name resolution to work. I seems to some of the time and then it doesn't.
Could someone fill me in on what I should know that I don't?
Can you tell us what platform you're on and what resolver option you are using?
Assuming you're using something other that netdb_1thread, iftop will attempt to resolve multiple addresses simultaneously, however it is possible that it will encounter a number of hosts for which the DNS servers are unavailable, in which case it will wait to time out on each of these hosts. If you encounter several of these at once, it will give the appearance of name resolution stopping.
Paul
On Mon, Jul 19, 2004 at 07:43:32AM -0400, das@onperfect.com wrote:
Well, I know it sounds old but we are using RedHat release 6.2 on this particular machine. It does the job when it comes to routing.
Should work fine on RH6.2.
I have not asked my son (who does alot of re-compiling of the kernel for various purposes) but I wouldn't be surprised if the kernel is different than the standard Red-Hat 6.2 kernel.
That shouldn't make any difference.
Give me a clue where to look for "netdb_1thread" and I'll take a look.
It's one of the options that you can give to the ./configure script. I'm assuming you built from source, in which case can you post your config.log.
Can you describe the exact symptoms? I'm assuming that it is still showing traffic, but that it starts using IP addresses rather than names after some point.
Paul
ok,
The dns server is on the same box. The ip's I'm most interested in is our private IP's. They are kept in the /etc/hosts /file.
Paul Warren writes:
On Sun, Jul 18, 2004 at 09:48:19PM -0400, das@onperfect.com wrote:
I use iftop (I love it) version 0.16. I seem to have some problem getting name resolution to work. I seems to some of the time and then it doesn't.
Could someone fill me in on what I should know that I don't?
Can you tell us what platform you're on and what resolver option you are using?
Assuming you're using something other that netdb_1thread, iftop will attempt to resolve multiple addresses simultaneously, however it is possible that it will encounter a number of hosts for which the DNS servers are unavailable, in which case it will wait to time out on each of these hosts. If you encounter several of these at once, it will give the appearance of name resolution stopping.
Paul
David Susen General Manager - OnPerfect Communications Network, Inc. 207-794-9065 office das@onperfect.com ****************************** This e-mail message, including any attachment(s), is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged and/or confidential. You are hereby notified that any use, dissemination, distribution and/or reproduction of this message and or any attachment(s) by unintended recipients is unauthorized and may be unlawful. Thank you for your cooperation. OnPerfect Communications Network, Inc. http://www.onperfect.com ******************************
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Paul Warren