David Bombal11 Maj 2022

#376: VPN slow? Network nightmares? How TCP really works: MTU vs MSS

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... // MY STUFF // https://www.amazon.com/shop/davidbombal // 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.youtube.com/davidbombal // Chris SOCIAL // Udemy course: https://davidbombal.wiki/chriswireshark LinkedIn: https://www.linkedin.com/in/cgreer/ YouTube: https://www.youtube.com/c/ChrisGreer Twitter: https://twitter.com/packetpioneer // SPONSORS // Interested in sponsoring my videos? Reach out to my team here: sponsors@davidbombal.com tcp mss mtu tcp/ip tcp ip ipv4 wireshark icmp slow icmp dropped packets wireshark tutorial wireshark training packet analysis packet capture tcp handshake tcp analysis tcp connections chris greer wireshark chris greer chris greer wireshark wireshark chris transport control protocol how tcp works tcp/ip transport protocol packet network mtu maximum transmission unit tcp mss maximum segment size free wireshark tutorial network troubleshooting tcp/ip analysis wireshark mtu wireshark mss ipsec gre mpls tunnels troubleshoot slow network troubleshooting slow networks troubleshoot slow internet Please note that links listed may be affiliate links and provide me with a small percentage/kickback should you use them to purchase any of the items listed or recommended. Thank you for supporting me and this channel! #wireshark #tcp #mtu

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