How TCP really works: MTU and MSS nightmares!

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/youtube/blob/main/PMTUD.pcapng War Story PCAP Client: https://github.com/packetpioneer/youtube/blob/main/slowfile-clientside.pcapng War Story PCAP Server: https://github.com/packetpioneer/youtube/blob/main/slowfile-serverside.pcapng Special “Thumbs Up” and “Subscribe” PCAP: https://github.com/packetpioneer/youtube/blob/main/tcp-streamexport.pcapng

// VLAD SOCIAL // Twitter: https://twitter.com/Packet_vlad PMTUD Blog: http://www.packettrain.net/2016/09/21/pmtud-or-not/ Thanks Vladimir Gerasimov!

// GOOD READING // Network Implications of PMTUD: https://www.ipspace.net/kb/Internet/PMTUD/30-network-implications.html Path MTU Discovery: https://www.ipspace.net/kb/Internet/PMTUD/20-mtu-discovery.html Resolve IPv4 Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPsec: https://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/25885-pmtud-ipfrag.html Configuring TCP MSS Adjustment: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/16-9/configuration_guide/ip/b_169_ip_3650_cg/configuring_tcp_mss_adjustment.pdf Ethernet MTU and TCP MSS Adjustment Concept for PPPoE Connections: https://www.cisco.com/c/en/us/support/docs/ip/transmission-control-protocol-tcp/200932-Ethernet-MTU-and-TCP-MSS-Adjustment-Conc.html

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// David SOCIAL // Discord: https://discord.com/invite/usKSyzb Twitter: https://www.twitter.com/davidbombal Instagram: https://www.instagram.com/davidbombal LinkedIn: https://www.linkedin.com/in/davidbombal Facebook: https://www.facebook.com/davidbombal.co TikTok: http://tiktok.com/@davidbombal YouTube: https://www.y ... https://www.youtube.com/watch?v=J-gnDC6B5eE