Re: How to delete an entry in ARP

X-No-Archive: Yes

On May 27, 4:10 pm, ibupro...@xxxxxxxxxxxxxxxxxxxxxx (Moe Trin) wrote:
On Tue, 27 May 2008, in the Usenet newsgroup comp.os.linux.networking, in
article <68bfa1c5-2809-469a-907b-e237f86d6...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,

soup_or_po...@xxxxxxxxx wrote:

NOTE: Posting from groups.google.com (or some web-forums) dramatically
reduces the chance of your post being seen.  Find a real news server.





<soup_or_po...@xxxxxxxxx> wrote:
<soup_or_po...@xxxxxxxxx> wrote:
(Moe Trin) wrote:
In host .30 and .35, run the command <A0>'/sbin/arp -an'
In host .30, run the command 'ping -c1 .35' (correct the hostname as
needed), and within sixty seconds run the command '/sbin/arp -an' again
on BOTH system. You should see an entry for the "other" computer in
each host. <A0> Now wait another 60 seconds, and repeat the '/sbin/arp -an'
command. If no other application ON EITHER SYSTEM is trying to talk to
the other computer, the arp entry should be gone.
Repeat this test on the "other" computer.
Repeat this test from the .46 computer and any others having problems
talking.
I did all the steps delineated above.

The ping between .35 and .30 works both ways.

Also the ping between .30 and .46 works both ways.

The ping from .35 to .46 works fine

However the ping from .46 to .35 does not work.

And the exact error message is...

Here is ARP table on .35

Try using the '/sbin/arp -an' command.

[root@npaxwebprod0Btmp]# more /proc/net/arp

An Intel (.1) and two kinds of Dell

Here is the ARP table on .46

That says .35 can see .46 and vice versa. Problem isn't at this level
Not used to this output, but find it unusual to see one's own MAC in
the ARP cache. This NORMALLY does not occur, because when "talking" to
oneself, one would use the Loopback interface which has no MAC. Look
at the output of '/sbin/ifconfig -a' and pay attention to the Transmit
and Receive counts.  Use the command 'ping -c1 some.other.host' and
look again at the ifconfig output - the counts for the eth0 interface
should have incremented, showing the packets went out and back on that
interface. Then repeat, but ping one's own IP address. The counts for
the eth0 interface should only reflect any _other_ external traffic,
while the pings show up as increments in the 'lo' line.

Here is the output of iptables -L on .35

OK - essentially no firewall

Here is the output of iptables -L on .46

More complicated, but looks OK

I can't ping .21 from .46. From .21 to .46 the ping works fine. I can
also ping .105, .100, .101, .102 from .46.

What is the exact command used to ping. What is the exact error message.

Gets weirder.

Does .46 have a packet sniffer installed (tcpdump, ethereal, wireshark
or similar)?

        Old guy- Hide quoted text -

- Show quoted text -

Hi Moe Trin

My employer is disciplining me regarding posting company data.

Could you kindly remove the following posts where you quoted my
message?

slrng3m7v3.e2t.ibuprofin@xxxxxxxxxxxxxxxxx
slrng3oqlu.8gl.ibuprofin@xxxxxxxxxxxxxxxxx
slrng3jvb1.org.ibuprofin@xxxxxxxxxxxxxxxxx

The following URL will enable you to remove the posts:


http://groups.google.com/groups/msgs_remove

Many thanks for your help

.

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