CMD ping requests not allowing more than 1000 bytes to be sent

windows networking ping cmd.exe

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As grawity said in the comments when your packet is larger than the MTU size fragmentation will occur. Because ICMP packets contain very short messages, there is no legitimate reason for ICMP packets to be fragmented. If an ICMP packet is so large that it must be fragmented, something is amiss. For this reason some network administrators will block any ICMP packet that has the More Fragments flag set or that has an offset value indicated in the offset field.

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15,002

I say Reinstate Monica

Updated on September 18, 2022

Comments

I say Reinstate Monica over 1 year

I can successfully ping, say, google.com via cmd using:

ping {IP ADDRESS} -T -L 1000

But if I use a packet size greater than "1001" I get a request timed out error. I know that the max amount of bytes I can send out is 65500.

Why is this?

P.S. My Internet is fine and I can access all websites through browsers.
- Admin almost 9 years
  
  On windows the format for ping is ip address after the options. So you should be using ping -t -l 1000 <ipaddress>
- Admin almost 9 years
  
  ping -t -l 9999 www.google.com works here (Windows 7). Perhaps you can give an example that fails?
user1686 almost 9 years

Jumbo Frames aren't very important here, as IP already supports fragmentation; a 2000-byte ICMP message over 1500 byte MTU would just be sent as two IP packets.