David Bombal #376: VPN slow? Network nightmares? How TCP really works: MTU vs MSS
May 11, 2022
01:07:01
Wireshark TCP Deep Dive continues: You need to understand this - whats the difference between Maximum Transmission Unit (MTU) vs Maximum Segment Size (MSS).
// MENU //
00:00 ▶️ Coming Up
00:25 ▶️ Intro
00:32 ▶️ Chris introduction
00:47 ▶️ Topic: Maximum Segment Size (MSS)
01:27 ▶️ Explaining Maximum Transmission Unit (MTU)
08:42 ▶️ Interface layout
10:25 ▶️ David Bombal "War Story"
12:00 ▶️ Wireshark demo
13:26 ▶️ Increasing the MTU on your device for larger connections
16:27 ▶️ Difference between MTU and MSS
19:36 ▶️ Wireshark demo (cont'd)
24:58 ▶️ Using Path MTU Discovery
27:02 ▶️ Ping and Wireshark demo
33:32 ▶️ Cool trick for Mac system
35:08 ▶️ TCP/MSS Clamping
38:21 ▶️ Chris Greer "War Story"
51:09 ▶️ What happens if you can't capture a server
55:08 ▶️ MSS Adjustment commands
56:55 ▶️ Tunnel Path MTU Discovery
57:40 ▶️ Figuring out 1432
01:02:52 ▶️ Conclusion
01:04:48 ▶️ "Cool features" in Wireshark
Previous video: https://youtu.be/rmFX1V49K8U
// Wireshark PCAP files //
MTU PCAP: https://github.com/packetpioneer/yout...
War Story PCAP Client: https://github.com/packetpioneer/yout...
War Story PCAP Server: https://github.com/packetpioneer/yout...
Special “Thumbs Up” and “Subscribe” PCAP: https://github.com/packetpioneer/yout...
// VLAD SOCIAL //
Twitter: https://twitter.com/Packet_vlad
PMTUD Blog: http://www.packettrain.net/2016/09/21...
Thanks Vladimir Gerasimov!
// GOOD READING //
Network Implications of PMTUD: https://www.ipspace.net/kb/Internet/P...
Path MTU Discovery: https://www.ipspace.net/kb/Internet/P...
Resolve IPv4 Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPsec: https://www.cisco.com/c/en/us/support...
Configuring TCP MSS Adjustment: https://www.cisco.com/c/en/us/td/docs...
Ethernet MTU and TCP MSS Adjustment Concept for PPPoE Connections: https://www.cisco.com/c/en/us/support...
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