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[Fwd: Re: TCP/IP] Strange double transmit of frames..

To: netdev@xxxxxxxxxxx
Subject: [Fwd: Re: TCP/IP] Strange double transmit of frames..
From: Harry Kalogirou <harkal@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 21 Jun 2001 14:20:21 +0000
Sender: owner-netdev@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux 2.4.4 i686; en-US; rv:0.9.1) Gecko/20010607


-------- Original Message --------
Subject: Re: TCP/IP
Date: Thu, 21 Jun 2001 13:16:15 +0000
From: Harry Kalogirou <harkal@xxxxxxxxxxxxxxxxxxx>
To: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
CC: Linux 8086 <linux-8086@xxxxxxxxxxxxxxx>
References: <E15CybL-0000r8-00@xxxxxxxxxxxxxxxxx>

Alan Cox wrote:

 >
 > No it isnt.
 >
 > That would be odd, and something I think everyone else would have noticed
 >


I do this :


/home/harkal# slattach -p slip -L -m -s 9600 /dev/ttyS1 & [1] 386 /home/harkal# ifconfig sl0 192.168.1.1 pointopoint elks


and now ifconfig gives :

/home/harkal# ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

sl0 Link encap:Serial Line IP
inet addr:192.168.1.1 P-t-P:192.168.1.100 mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:296 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10

route gives:
/home/harkal# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
elks * 255.255.255.255 UH 0 0 0 sl0

Then I boot elks and I ping it. Just "ping elks".
tcpdump records :

/home/harkal# tcpdump -i sl0
tcpdump: listening on sl0
13:02:55.137218 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:55.252131 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:55.352130 192.168.1.100 > 192.168.1.1: icmp: echo reply (DF)
13:02:56.132513 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:56.252131 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:56.342129 192.168.1.100 > 192.168.1.1: icmp: echo reply (DF)
13:02:57.132471 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:57.252130 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:57.342130 192.168.1.100 > 192.168.1.1: icmp: echo reply (DF)
13:02:58.133342 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:58.252130 192.168.1.1 > 192.168.1.100: icmp: echo request (DF)
13:02:58.342130 192.168.1.100 > 192.168.1.1: icmp: echo reply (DF)

?!?!??!!?


kernel version is 2.4.4 ... What can be wrong?

-------- End of Original Message --------

I was sugested to post this here...
I would like to mark that the ping process
only sended 4 icmp echos ...

--
 ___          ___              ________
(*| |  |     (*| | /          (_HarKal_)
|___|--|arry |___| \alogiroy     \/\/

web : http://rainbow.cs.unipi.gr/~harkal



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