[root@*****]# yum -y install tcpreplay
Loaded plugins: fastestmirror, langpacks
http://mirror.bit.edu.cn/centos/7.7.1908/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.bit.edu.cn/centos/7.7.1908/os/x86_64/repodata/repomd.xml: (28, 'Resolving timed out after 30542 milliseconds')
解决方案(修改DNS解析服务地址):
[root@zsx ~]# cat /etc/resolv.conf
; generated by /usr/sbin/dhclient-script
nameserver 114.114.114.114
nameserver 8.8.8.8
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