CentOS6 32bit
32bit wget http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/i386/epel-release-6-8.noarch.rpm
64bit wget http://ftp.iij.ad.jp/pub/linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
yum install iftop.i686
[root@kensyousever ~]# yum install iftop.i686 Loading mirror speeds from cached hostfile * base: ftp.nara.wide.ad.jp * epel: mirror.premi.st * extras: ftp.nara.wide.ad.jp * rpmforge: mirror.fairway.ne.jp * updates: ftp.nara.wide.ad.jp
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iftop i686 1.0-0.7.pre4.el6 epel 48 k ==============================================================================
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iftop-1.0-0.7.pre4.el6.i686.rpm | 48 kB 00:00 1/1 Verifying : iftop-1.0-0.7.pre4.el6.i686 1/1 iftop.i686 0:1.0-0.7.pre4.el6