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networking:ping [2021/11/15 09:49] – bstaffordnetworking:ping [2022/11/23 12:49] (current) – external edit 127.0.0.1
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 ===== Ping without Framenting ===== ===== Ping without Framenting =====
 +
 +Data from Palo Alto Networks [[https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PN0gCAG|here]].
 +
 -f will mean that the ping is only sent if it isn't fragmented. -f will mean that the ping is only sent if it isn't fragmented.
  
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 1372 Bytes + ICMP header 8 Bytes + IP header 20 Bytes = 1400 Bytes.  1372 Bytes + ICMP header 8 Bytes + IP header 20 Bytes = 1400 Bytes. 
 +
 +To determine the Optimal MSS that can be used, take the result of the above test which is 1400 Bytes and subtract the potential TCP header and IP header value. 
 +
 +1400 Bytes - (IP header 20 Bytes + TCP header 20 Bytes) = 1360 Bytes. 
 +
 +So the Optimal MSS that can be used is 1360 Bytes. 
 +
 +On PA firewall to adjust the MSS value to 1360 Bytes, the Adjustment size has to be configured as 140 Bytes.
 +
 +1500 - 1360 = 140 Bytes
 +
 +===== Windows Show MTU =====
 +Show MTU on Windows. It is in the left column
 +<code>netsh interface ipv4 show subinterface</code>
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