packet tracer 5.3已经出来了，并已经有Linux版本。
新版本开始支持BGP。
Protocol Improvements
Packet Tracer now models these protocols not included in earlier versions: FTP, SMTP, POP3,PPPoE, VoIP, and BGP. CCNA-related protocols and technologies include improved models of HTTP,DNS, DHCP, TCP, and IP.

General Improvements

* Supports Microsoft Window 7 and stopped support for Microsoft Windows 2000
* Supports current LTS version of Ubuntu and Fedora and stopped support for previous versions
* Improved IPC features
* Customizable HTML Views for IP configuration and Traffic Generator in generic Wired End Device and generic Wireless End Device
* nslookup and ftp commands for end devices
* Email and FTP service for server end device
* Cisco IP Communicator, Email, PPPoE Dialer, and Text Editor desktop utilities
* HWIC-AP-AG-B module for 1841 and 2811 routers
下载地址1：

http://u.115.com/file/f570cd0446
PacketTracer53_setup.exe 2010-10-30重新补档

下载地址2：
Packet Tracer v5.3 Application + Tutorial[Windows]
点我下载(EXE – 73.9 MB)

Packet Tracer v5.3 Application only[Windows]
点我下载(EXE – 41.8 MB)

Packet Tracer v5.3 Application + Tutorial Linux-Ubuntu
点我下载(BIN – 97.2 MB)

Packet Tracer v5.3 Application only Linux-Ubuntu
点我下载(BIN – 64.8 MB)

Packet Tracer v5.3 Application + Tutorial -Generic Ubuntu
点我下载(tar.gz – 97.9 MB)

Packet Tracer v5.3 Application + Tutorial Linux-Fedora
点我下载(BIN – 94.4 MB)

Packet Tracer v5.3 Application only Linux-Fedora
点我下载(BIN – 62.0 MB)

Packet Tracer v5.3 Application + Tutorial Generic Fedora
点我下载(tar.gz – 94.4 MB)

软件截图：

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目前最新版Cisco Packet Tracer5.3.2

What’s New

Users of previous versions of Packet Tracer will note a variety of new features in this version of Packet Tracer.

Protocol Improvements

Packet Tracer now models these protocols not included in earlier versions: FTP, SMTP, POP3, PPPoE, VoIP, and BGP. CCNA-related protocols and technologies include improved models of HTTP, DNS, DHCP, TCP, and IP.

General Improvements

• Supports Microsoft Window 7 and stopped support for Microsoft Windows 2000
• Supports current LTS version of Ubuntu and Fedora and stopped support for previous versions
• Improved IPC features
• Customizable HTML Views for IP configuration and Traffic Generator in generic Wired End Device and generic Wireless End Device
• nslookup and ftp commands for end devices
• Email and FTP service for server end device
• Cisco IP Communicator, Email, PPPoE Dialer, and Text Editor desktop utilities
• HWIC-AP-AG-B module for 1841 and 2811 routers

New Devices

End Devices

• Home VoIP
• Analog Phone
• TV
• Tablet PC
• PDA
• Wireless End Device
• Wired End Device

Hub

• Coaxial Splitter

Download Link:115网盘下载链接

http://u.115.com/file/f95df8aa6f#
PacketTracer532_setup_no_tutorials.zip

参考资料：

http://www.joysin.net/network/sim/cisco-packet-tracer-532.html

updated：2011-03-21