Category Archives: Uncategorized

Downgrade Software on Router That Runs Cisco IOS-XE SD-WAN to Classic Cisco IOS-XE Software

Problem The user cannot configure boot system flash bootflash: image settings in order to boot the original Cisco IOS-XE image: router#config-transaction admin connected from 127.0.0.1 using console on routerrouter(config)# boot ? ^ % Invalid input detected at ‘^’ marker. router(config)# boot system flash bootflash:c1100-universalk9_ias.16.06.05.SPA.bin ——————-^ syntax error: unknown command Solution The procedure is similar to a software… Read More »

Metro Ethernet Services

Type of services offered by Metro E E-Line (Ethernet Line Service) point-to-point connection between two sites Just think like you have a direct cable from branch to HQ Another common name for E-Line is VPWS (Virtual Private Wire Service) E-LAN (Ethernet LAN Service) It’s a full-mesh topology that acts like a big switch Commonly used… Read More »

VPN Ports

  PPTP:To allow PPTP tunnel maintenance traffic, open TCP 1723.To allow PPTP tunneled data to pass through router, open Protocol ID 47. L2TP over IPSecTo allow Internet Key Exchange (IKE), open UDP 500.To allow IPSec Network Address Translation (NAT-T) open UDP 4500.To allow L2TP traffic, open UDP 1701. OpenVPN: OpenVPN uses port 1194 udp and… Read More »