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tech:network:tcp-ip:mtu-mss:mtu-mss

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tech:network:tcp-ip:mtu-mss:mtu-mss [2019/04/11 20:52] (current)
wnoguchi created
Line 1: Line 1:
 +====== MTU/MSS Cheat Sheet ======
 +
 +{{tag>​MTU MSS TCP/IP TCP Networking}}
 +
 +  - MSS 1500 - 24 = 1476 (Ethernet + GRE)
 +  - MSS 1500 - 8 = 1492 (PPPoE)
 +  - MSS 1454 - 40 = 1414 (NTT NGN + PPPoE)
 +  - MSS 1454 - 40 - 24 = 1390 (NTT NGN + PPPoE + GRE)
 +  - MSS 1356 - 24 = 1332 (NTT NGN + PPPoE + IPsec(3des, md5-hamc)+ GRE)
 +
 +NTT NGN + PPPoE
 +
 +  * MTU 1454
 +  * MSS 1414
 +
 +NTT NGN + PPPoE + IPsec(ESP, Tunnel mode)
 +
 +  * MSS 1356
 +  * 1414 - 1356 = 58
 +    * = IP(20) + ESP Header(SPI 4 + Seq 4) + IV (8 (3des: Part of Payload Data)) + ESP Footer(8 (Padding 0 ~ 7 + Pad Length 1 + Next Header 1) + SHA1 12(Authentication Data))
 +    * = 20 + 4 + 4 + 8 + 8 + 12 = 56
 +
 +Padding Must be times 8
 +
 +?
  
tech/network/tcp-ip/mtu-mss/mtu-mss.txt · Last modified: 2019/04/11 20:52 by wnoguchi