Re: Too Much ARP-ing

Jason A. Garver (garver@b64198.student.cwru.edu)
Mon, 27 Jan 1997 14:59:13 -0500 (EST)

> On Mon, 27 Jan 1997, A.N.Kuznetsov wrote:
>
> > In article <199701270218.VAA09752@delta.CES.CWRU.Edu> you wrote:
> >
> > : This is a typical scenario from tcpdump -p (my machine is jeff):
> > : 15:30:37.455806 arp who-has hunny.INS.CWRU.Edu tell ins02055.INS.CWRU.Edu
> > : 15:30:37.455806 arp who-has ins02055.INS.CWRU.Edu tell jeff.krafty.com
> > : 16:27:55.025806 arp who-has hunny.INS.CWRU.Edu tell b64471.STUDENT.CWRU.Edu
> >
> How much data is supposed to be in /proc/net/rt_cache ???? Once my machine
> has been up for about 24 hours:
>
> # cat /proc/net/rt_cache >/tmp/xxx.xxx
> # ls -la /tmp/xxx.xxx
> -rw-r--r-- 1 root root 9123680 Jan 27 13:22 /tmp/xxx.xxx
>
> This is a very large file, containing mostly the same entires repeated!
> Aren't these supposed to expire or go away? Eventually, there is no more
> room (somewhere) and it is not possible to log in over the network.
>
Just as a data point, I use the same card, am on the same net as Joel Kraft,
but not on the same segment, this is what I get from my box:

garver@b64198:~]$ cat /proc/version
Linux version 2.0.24 (root@b64198.student.cwru.edu) (gcc version 2.7.2) #14 Tue Dec 10 12:45:20 EST 1996
[garver@b64198:~]$ uptime
2:47pm up 39 days, 23:03, 20 users, load average: 0.01, 0.03, 0.00
[garver@b64198:~]$ cat /proc/net/rt_cache > /tmp/xxx.xxx
[garver@b64198:~]$ ls -l /tmp/xxx.xxx
-rw-r--r-- 1 garver users 2688 Jan 27 14:48 /tmp/xxx.xxx

My rt_cache is much smaller and things do dissapear from it.

More data on the net here: One big ethernet (no routing
at all), with at least 5000 active nodes. Basically what this means is that
there are a hell of a lot of ARP packets and other broadcasts floating around.
"procinfo" shows that there have been 292 million interupts at the net
adapter's IRQ almost as many as the timer itself with 345 million.

Hope this helps some... Even being here, I'm at a loss as to what Joel's
problem could be. But it works for me with a similar config.

Later,
Jake