O-+WAN+Protocols

PPP [|Understanding and Configuring PPP CHAP Authentication] [|Configuring and Troubleshooting PPP Password Authentication Protocol (PAP)] [|Troubleshooting PPP (CHAP or PAP) Authentication] [|Understanding debug ppp negotiation Output] [|PPP CHAP/PAP Authentication over an IPv6 Serial Link Configuration Example] [|PPPoE Client-Server setup and configuration] [|Configuring and troubleshooting Router as a PPPoE client] [|PPP over Ethernet Client] [|VoIP over PPP Links with Quality of Service (LLQ / IP RTP Priority, LFI, cRTP)] [|Multiple Multilink Bundles Between Routers]

NAT [|Sample Configuration Using the ip nat outside source list Command] [|Configuring Network Address Translation: Getting Started] [|NAT: Local and Global Definitions] [|How NAT Handles ICMP Fragments] [|NAT Order of Operation] [|Network Address Translation (NAT) FAQ] [|Verifying NAT Operation and Basic NAT Troubleshooting] [|Network Address Translator-Protocol Translator] [|CISCO IOS NETWORK ADDRESS TRANSLATION] [|NAT and PAT: a complete explanation] [|NAT Virtual Interface aka NVI, what is that?!]

Aux Ports [|Connecting Routers Back-to-Back Through the AUX Ports] [|Configuring AUX-to-AUX Port Async Backup with Dialer Watch]

TDM Circuit & Clocking [|TDM Circuit DSP Clocking, Slippage and Synchronization Tech Note] [|Clocking Configurations On Voice-Capable IOS-Based Platforms]

T1/E1 [|Cisco 1- and 2-port T1/E1 Multiflex Voice/WAN Interface Cards for the Cisco 1721 Router] [|1-Port and 2-Port HWIC data/voice, 4-Port T1/E1 HWIC, and 8-Port T1/E1 Network Module]

E1 Interface [|Understanding the show controllers e1 Command]

T1 Error [|Slip Errors are seen on T1 PRI where Slip Secs Counter continuously increases] [|PRI backplane clock source]

WAN Alarms [|T1 Alarm Troubleshooting] [|T3 Alarm troubleshooting] [|E1 Alarm Troubleshooting] [|E3 Alarm Troubleshooting]

WAN Troubleshooting [|T1 Layer 1 Troubleshooting] [|E1 Layer 1 Troubleshooting] [|T1/E1 Loopback Testing and Troubleshooting] [|T1 Error Events Troubleshooting] [|E1 Error Events Troubleshooting] [|T3 Error Events Troubleshooting] [|E3 Error Events Troubleshooting] [|TROUBLESHOOTING WAN PROTOCOLS IN CISCO IOS SOFTWARE]

Serial Line [|Troubleshooting Serial Line Problems]