What's going here?

From: Taso Hatzi (taso@esands.com)
Date: Sun Jan 30 2000 - 20:48:15 EST


>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
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