yum コマンドで localinstall を指定すると、依存関係を解決してくれるので楽です。
1. 入手
[i386]
http://www.nomachine.com/download-package.php?Prod_Id=2519
http://64.34.161.181/download/3.4.0/Linux/nxclient-3.4.0-7.i386.rpm
http://64.34.161.181/download/3.4.0/Linux/nxnode-3.4.0-16.i386.rpm
http://64.34.161.181/download/3.4.0/Linux/FE/nxserver-3.4.0-17.i386.rpm
[x86_64]
http://www.nomachine.com/download-package.php?Prod_Id=2518
http://64.34.161.181/download/3.4.0/Linux/nxclient-3.4.0-7.x86_64.rpm
http://64.34.161.181/download/3.4.0/Linux/nxnode-3.4.0-16.x86_64.rpm
http://64.34.161.181/download/3.4.0/Linux/FE/nxserver-3.4.0-17.x86_64.rpm
2. インストール
[i386]
# yum localinstall –nogpgcheck nxclient-3.4.0-7.i386.rpm
# yum localinstall –nogpgcheck nxnode-3.4.0-16.i386.rpm
# yum localinstall –nogpgcheck nxserver-3.4.0-17.i386.rpm
[x86_64]
# yum localinstall –nogpgcheck nxclient-3.4.0-7.x86_64.rpm
# yum localinstall –nogpgcheck nxnode-3.4.0-16.x86_64.rpm
# yum localinstall –nogpgcheck nxserver-3.4.0-17.x86_64.rpm
3. 設定など