Re: What's going here?

From: xplore@ump.music.ro
Date: Sun Jan 30 2000 - 22:58:29 EST


On Mon, 31 Jan 2000, Taso Hatzi wrote:

>
> >From Linux (2.2.5 & 2.3.40)
>
> $ ping -c 5 -s 56 www.ibm.com
> PING www.ibm.com (204.146.80.99): 56 data bytes
> 64 bytes from 204.146.80.99: icmp_seq=0 ttl=243 time=481.5 ms
> 64 bytes from 204.146.80.99: icmp_seq=1 ttl=243 time=414.8 ms
> 64 bytes from 204.146.80.99: icmp_seq=2 ttl=243 time=454.6 ms
> 64 bytes from 204.146.80.99: icmp_seq=3 ttl=243 time=408.3 ms
> 64 bytes from 204.146.80.99: icmp_seq=4 ttl=243 time=407.6 ms
>
> but
>
> $ ping -c 5 -s 55 www.ibm.com
> PING www.ibm.com (204.146.81.99): 55 data bytes
>
> --- www.ibm.com ping statistics ---
> 5 packets transmitted, 0 packets received, 100% packet loss
>
>
>
> Doing the same from WinNT works as I would expect.
> Why does Linux only work if the packet size is 2*N

I don't know what your linux does but mine works fine...

[root@ump /root]# ping -c 5 -s 55 www.ibm.com
PING www.ibm.com (204.146.81.99) from 193.231.212.56 : 55(83) bytes of
data.
63 bytes from 204.146.81.99: icmp_seq=0 ttl=241 time=579.2 ms
63 bytes from 204.146.81.99: icmp_seq=1 ttl=241 time=581.8 ms
63 bytes from 204.146.81.99: icmp_seq=2 ttl=241 time=613.8 ms
63 bytes from 204.146.81.99: icmp_seq=3 ttl=241 time=598.9 ms
63 bytes from 204.146.81.99: icmp_seq=4 ttl=241 time=575.7 ms

--- www.ibm.com ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 575.7/589.8/613.8 ms
[root@ump /root]# ping -c 5 -s 56 www.ibm.com
PING www.ibm.com (204.146.80.99) from 193.231.212.56 : 56(84) bytes of
data.
64 bytes from 204.146.80.99: icmp_seq=0 ttl=241 time=596.1 ms
64 bytes from 204.146.80.99: icmp_seq=1 ttl=241 time=598.5 ms
64 bytes from 204.146.80.99: icmp_seq=2 ttl=241 time=615.2 ms
64 bytes from 204.146.80.99: icmp_seq=3 ttl=241 time=600.9 ms
64 bytes from 204.146.80.99: icmp_seq=4 ttl=241 time=594.3 ms

--- www.ibm.com ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 594.3/601.0/615.2 ms
[root@ump /root]#

-------------
   xplore

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