You are correct. Simulating a fping via shell I can see that the biggest value is 4096, as you can see below:
fping -b 7300 -C 5 172.16.254.150 172.16.254.150 : [0], 4096 bytes, 79.3 ms (79.3 avg, 0% loss) 172.16.254.150 : [1], 4096 bytes, 96.6 ms (87.9 avg, 0% loss) 172.16.254.150 : [2], 4096 bytes, 121 ms (99.1 avg, 0% loss) 172.16.254.150 : [3], 4096 bytes, 82.8 ms (95.0 avg, 0% loss) 172.16.254.150 : [4], 4096 bytes, 156 ms (107 avg, 0% loss) fping -b 8096 -C 5 172.16.254.150 172.16.254.150 : [1], 4096 bytes, 96.1 ms (96.1 avg, 50% loss) 172.16.254.150 : [2], 4096 bytes, 77.4 ms (86.8 avg, 33% loss) 172.16.254.150 : [3], 4096 bytes, 129 ms (101 avg, 25% loss) 172.16.254.150 : [4], 4096 bytes, 134 ms (109 avg, 20% loss) I'm using a FreeBSD 6.0 and pinging machines in an ethernet segment. I don't know exactly if this is an OS limitation or fping limitation because ping works correctly, as you can see below: ping -s 8096 -c 5 172.16.254.150 PING 172.16.254.150 (172.16.254.150): 8096 data bytes 8104 bytes from 172.16.254.150: icmp_seq=0 ttl=255 time=69.757 ms 8104 bytes from 172.16.254.150: icmp_seq=1 ttl=255 time=71.283 ms 8104 bytes from 172.16.254.150: icmp_seq=2 ttl=255 time=79.959 ms 8104 bytes from 172.16.254.150: icmp_seq=3 ttl=255 time=75.632 ms 8104 bytes from 172.16.254.150: icmp_seq=4 ttl=255 time=85.651 ms Thanks. Edinilson --------------------------------------------------------- ATINET-Professional Web Hosting Tel Voz: (0xx11) 4412-0876 http://www.atinet.com.br ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Edinilson J. Santos" <[email protected]> Sent: Tuesday, March 21, 2006 11:16 PM Subject: Re: [smokeping-users] Biggest fping size On 3/20/06, Edinilson J. Santos <[email protected]> wrote: > I'm trying to use fping with packetsize ABOVE 7300 without success (for > example, packetsize = 8192). > Graphs simply returns nothing. > > Any idea? > > Thanks > > Edinilson Hi Edinilson, Different systems limit what the max supported ping value is. Note that both the max on the SmokePing server and the destination being pinged can limit the max size. But, assuming that you are pinging over an Ethernet network (that isn't doing jumbo frames on and end-to-end basis), you will effectively be limited to an fping payload size (I'm assuming fping here) of 1472 bytes (with 8 bytes of ICMP and 20 bytes of IP that gets you to 1500 bytes, the max non-jumbo Ethernet payload size). Most systems support something bigger than this, but they just fragment the payload across multiple frames of maximum 1500 bytes. Regards, H -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/smokeping-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
