[28642] in North American Network Operators' Group
=?gb2312?B?u9i4tDogU3RyYW5nZSByZXN1bHQgd2hpbGUgcGluZyBzZXJpYWwgaQ==?=
daemon@ATHENA.MIT.EDU (Yu Ning)
Wed May 10 22:04:51 2000
Message-ID: <00b701bfbaec$c5c910c0$9c0361ca@odie_ibm.chinanet.cn.net>
From: "Yu Ning" <yuning@cndata.com>
To: "Dumb Kid" <dumbkid0@yahoo.com>, "nanog-post" <nanog@merit.edu>
Date: Thu, 11 May 2000 10:00:14 +0800
MIME-Version: 1.0
Content-Type: text/plain;
charset="gb2312"
Content-Transfer-Encoding: 7bit
Errors-To: owner-nanog-outgoing@merit.edu
Hi,
But it's obviously inefficient. Is it due to some inability of
PPP ? Or can you tell what reason makes the packets a round
trip ?
Since the router should have the information of its local interface,
why should it always send packets out, the get it back ?
regards,
Yu Ning
-----Original Message-----
From: Dumb Kid <dumbkid0@yahoo.com>
To: Yu Ning <yuning@cndata.com>; nanog-post <nanog@merit.edu>
Date: Thursday, May 11, 2000 9:45 AM
Subject: Re: Strange result while ping serial interface
>Yeah , it's normal. The packet actually travels to the
>other end of the router over the serial and back.
>That's why the response time is doubled.
>
>
>
>--- Yu Ning <yuning@cndata.com> wrote:
>>
>> Hi nanog,
>>
>> Strange thing happens everyday. When I were
>> troubleshooting yestoday,
>> I found a ping to my local serial interface (no
>> matter it's 155M POS,
>> or 2M Serial interface) takes nearly twice delay
>> compared with a ping
>> to the remote side of the serial interrface ! When I
>> trace to my local
>> serial interface, I got the first hop to the remote
>> end, then second
>> hop back to my local interface !
>>
>> For example, 202.97.2.1 is local serial interface,
>> while 2.2 is remote
>> side. A trace on 2.1 to 2.1 first go to 2.2, then
>> back to 2.1. And this
>> situation can be verified on both side.
>>
>> Have you ever seen this situation ? Is it due to our
>> misconfiguration?
>> or it's sheerly a mis-display of result in Cisco box
>> (can't believe it)
>>
>> The background is: we're using ISIS as IGP, and
>> utilized level-1/2 link.
>>
>> thanks for any input.
>>
>> regards,
>>
>> Yu Ning
>> -------------------------------------------
>> (Mr.) Yu(2) Ning(2)
>> ChinaNet Backbone Operation
>> Networking Dep.,Datacom Bureau
>> China Telecom.,Beijing(100088),P.R.C
>> +86-10-66418121/66418122/66418123(fax)
>> -------------------------------------------
>>
>>
>>
>
>
>=====
>
>--
>D.U.M.B.K.I.D.
>
>__________________________________________________
>Do You Yahoo!?
>Send instant messages & get email alerts with Yahoo! Messenger.
>http://im.yahoo.com/
>
