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ping -l

Posted on 2011-02-15
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whats the maximum value you can use for a ping -l

is this the same as the mtu value thats configured on the switch?

Thanks
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Question by:jly999
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RobMobility earned 1200 total points
ID: 34896679
Hi,

I don't believe there is a limit in Windows - if the MTU size is exceeded, then the packet will be fragmented. You can prevent this by adding -f switch.

In other OS, there is a limit.

More information here:

http://msdn.microsoft.com/en-us/library/cc737478(v=ws.10).aspx

Regards,


RobMobility.
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Author Comment

by:jly999
ID: 34896751
so if i'm seeing timeouts with  >ping -l 64000 could that indicate a network problem ?
pings below  24000 show no issue

I did think  1500-byte packet was the largest allowed..?
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LVL 25

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by:RobMobility
ID: 34896783
Hi,

If you send a packet larger than the MTU, it's fragmented. If you include the -f switch, then packets are not fragmented.

Regards,


RobMobility.
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LVL 25

Expert Comment

by:RobMobility
ID: 34896797
Hi,

It looks like 65535 including the ICMP header is the largest size permnittable for ping.

Regards,


RobMobility.
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LVL 25

Expert Comment

by:RobMobility
ID: 34896815
Hi,

Thats IPv4 packet size maximum, although it is often regarded as the Ping Of Death as a buffer overrun can occur with such large pings.

Regards,


RobMobility.
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LVL 24

Assisted Solution

by:rfc1180
rfc1180 earned 800 total points
ID: 34899538
64000 Bytes requires 512Kbps worth of bandwidth.
At 1500 bytes for the MTU, that would be 42 packets a second  (not including overhead at layer 2 and 3) assuming fragmentation on the intermdiary nodes (Routers). So, if you do not have the resources (Bandwidth, CPU, PPS, etc.) to handle that, you will get packet loss.

Billy
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