aria2 是另一款 Linux 下轻量级的多线程下载工具，支持Http/Https、Ftp、BitTorrent、Metalink协议。它比 axel 优秀的地方在于：

完全支持 BitTorrent 协议，同时可以作为 BitTorrent 客户端来下载种子文件；支持 Metalink 协议；远程控制（通过 web 端）下载进程。

先把依赖包gmp-devel、gnutls-devel装上：
yum install gmp-devel -y
yum install gnutls-devel -y

64位安装

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=1362140&name=aria2-1.16.4-1.el6.rf.x86_64.rpm

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=364940&name=nettle-2.2-1.el6.rf.x86_64.rpm

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=31980&name=nettle-devel-2.2-1.el6.rf.x86_64.rpm

wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/x86_64/dag/RPMS/aria2-1.16.4-1.el6.rf.x86_64.rpm
wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/x86_64/dag/RPMS/nettle-2.2-1.el6.rf.x86_64.rpm
wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/x86_64/dag/RPMS/nettle-devel-2.2-1.el6.rf.x86_64.rpm

rpm -ivh nettle-2.2-1.el6.rf.x86_64.rpm
rpm -ivh nettle-devel-2.2-1.el6.rf.x86_64.rpm
rpm -ivh aria2-1.16.4-1.el6.rf.x86_64.rpm

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32位安装

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=1362768&name=aria2-1.16.4-1.el6.rf.i686.rpm

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=367848&name=nettle-2.2-1.el6.rf.i686.rpm

http://rpm.pbone.net/index.php3?stat=26&dist=74&size=32008&name=nettle-devel-2.2-1.el6.rf.i686.rpm

wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/i386/dag/RPMS/aria2-1.16.4-1.el6.rf.i686.rpm
wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/i386/dag/RPMS/nettle-2.2-1.el6.rf.i686.rpm
wget ftp://ftp.pbone.net/mirror/dag.wieers.com/redhat/el6/en/i386/dag/RPMS/nettle-devel-2.2-1.el6.rf.i686.rpm

rpm -ivh nettle-2.2-1.el6.rf.i686.rpm
rpm -ivh nettle-devel-2.2-1.el6.rf.i686.rpm
rpm -ivh aria2-1.16.4-1.el6.rf.i686.rpm