(1.3.01. Increase the function of saving topology and configuration files (the saved topology supports double-clicking to open it and needs to be related) 2. Beautify the software interface 3. Add online updates 4. Fix some known bugs 1.2.21. , which caused the PC to fail after a period of time after opening the emulator. Thank you netizen LeBeton for writing a brief application instruction! 1.2.11. Support custom topology 2. No need to install WinPcap_3_0 (can be used in versions above WinPcap_4x, if it cannot be used, please install any version of WinPcap) 3. Can communicate with VPCS and GNS3 Note: The console of the router is 2001 began to be exchanged for 2101 beginning 1. Because the use of 49M CEN, the exchange is still very weak)