Sun Rays can't handle packet fragmentation - they just drop fragmented
packets. Adjust the MTU down until you don't get any fragmentation
through your ATM link.
The best option is to use a ping that supports packet size and the
don't fragment option and keep dropping the packet size until it
reliably gets through without fragmentation, then put the MTU option
into your DHCP servers for the remote subnet. You shouldn't need to
drop the MTU on the Sun Ray server.
I finally managed to install hping3 and there are no packets lost when sending 1460 byte data. The MTU on the ethernet interface is 1500 (in fact, all ethernet interfaces have an 1500 MTU here) and as far as I know, SDH has an MTU of 4474, which should be just fine.
# ifconfig ce5
ce5: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 5
inet 10.174.0.28 netmask fffffe00 broadcast 10.174.1.255
ether 0:3:ba:35:fa:33
# ~/share/sparc/SunOS/hping3-20051105/bin/hping3 -I ce5 -y -c 5 -i 1 -d 1460 10.174.64.44
HPING 10.174.64.44 (ce5 10.174.64.44): NO FLAGS are set, 40 headers + 1460 data bytes
len=46 ip=10.174.64.44 ttl=60 DF id=36545 sport=0 flags=RA seq=0 win=0 rtt=16.3 ms
len=46 ip=10.174.64.44 ttl=60 DF id=36547 sport=0 flags=RA seq=1 win=0 rtt=27.9 ms
len=46 ip=10.174.64.44 ttl=60 DF id=36549 sport=0 flags=RA seq=2 win=0 rtt=29.2 ms
len=46 ip=10.174.64.44 ttl=60 DF id=36551 sport=0 flags=RA seq=3 win=0 rtt=26.8 ms
len=46 ip=10.174.64.44 ttl=60 DF id=36553 sport=0 flags=RA seq=4 win=0 rtt=25.7 ms
--- 10.174.64.44 hping statistic ---
5 packets tramitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 16.3/25.2/29.2 ms
#
Any other ideas?
Thanks,
tom
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