Arp table - Newbie
05/11/2017 14:54
Hi, The server was not able to connect to the network. When arp -a was issued, the response from the server was very slow and initially the Mac address of the gateway was blank. When arp -a re-issued, the gateway entry was not listed. After I did a reboot of the server, the gateway entry is back in the arp table.

Is there a way to investigate why the arp table lost its data so as to prevent future occurrence? Server: E4500 OS: Solaris 8 Thanks in advance.

Source is Usenet: comp.unix.solaris
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Answer score: 5
05/11/2017 14:54 - Dolphin <yc282004@yahoo.com.sg> writes: Yikes. That doesn't look happy to me.

It's really unclear to me where the problem is coming from. I _doubt_ that it really has anything to do with the network interfaces, but ifconfig(1M) can be used to shut them down and restart them.

This sounds like a name services or application problem of some sort.

-- James Carlson, KISS Network <james.d.carlson@sun.com> Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084 MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677

Source is Usenet: comp.unix.solaris
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05/11/2017 14:54 - James Carlson wrote: Is there a way to show that the server submitted a request but failed to get reply from DNS? The reason why I need this is becuase the servers (more than one) next to this don't have this problem.

Is it easy to use?

Source is Usenet: comp.unix.solaris
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05/11/2017 14:54 - On 31/5/06 6:32, in article 1149053522.143011.266570@f6g2000cwb.googlegroups.com, Dolphin <yc282004@yahoo.com.sg> wrote: Only (easily) by watching the network traffic from your machine using something like snoop. For example in one window, type dig www.eg.com and then run snoop in a different window before pressing return in the first.

You'll get something like: # snoop -r udp and port 53 Using device /dev/e1000g0 (promiscuous mode) 172.16.0.138 -> 172.16.0.2 DNS C www.eg.com. Internet Addr ? 172.16.0.2 -> 172.16.0.138 DNS R www.eg.com. Internet Addr 62.3.217.251 The output should be pretty self-explanatory ;-) Note the -r to stop snoop from trying to resolve any IP addresses during output, which would confuse any attempts to diagnose name resolution problems...

Yes, though it uses X and needs root, and is perhaps a bit of a sledgehammer. It /is/ a great tool to know how to use, but like James said it might be a distraction at this point for you.

Cheers, Chris

Source is Usenet: comp.unix.solaris
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05/11/2017 14:54 - Chris Ridd wrote: When I ping an unknown site (eg: www.123.com). In the other session, I did the following: $snoop host <dns> Using device /dev/ge (promiscuous mode) <server> -> <dns> DNS C www.123.com. Internet Addr ? <dns> -> <server> DNS R www.123.com. Internet CNAME portal-web.entelchile.net.

<server> -> <dns> DNS C 255.255.255.255.in-addr.arpa. Internet PTR ? <dns> -> <server> DNS R Error: 3(Name Error) The happens to other servers as well, hence, should the Error genuine? Since the problem gone after server reboot, there must be scripts to restart the network interface. Where are the scripts doing this? I was thinking just to run (stop / start) these scripts when the problem recurr (it happened again yesterday) rather rebooting.


Source is Usenet: comp.unix.solaris
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Answer score: 5
05/11/2017 14:54 - Dolphin <yc282004@yahoo.com.sg> writes: That doesn't sound good.

Yes, it sounds like it. At a guess, you're missing IN PTR records for in-addr.arpa (reverse name resolution).

You might find ethereal easier to use, but I don't want to force another tool on you while you're in the middle of troubleshooting ...

-- James Carlson, KISS Network <james.d.carlson@sun.com> Sun Microsystems / 1 Network Drive 71.232W Vox +1 781 442 2084 MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677

Source is Usenet: comp.unix.solaris
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Answer score: 5
05/11/2017 14:54 - Hi, Appreciate you can advice the alternate way if reboot shouldn't be necessary.

I got the following when I run snoop and direct to a file (ie snoop > /tmp/mylog): <dns> -> <my_server_name> DNS R Error: 3(Name Error) Am I right to say that there is problem getting respond from dns? PS: This is my first time using snoop Thanks in advance.


Source is Usenet: comp.unix.solaris
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