In general when your network shows up with eth1 instead of eth0 bells should be going off (at least in CentOS 6.x). Correct your IPv6 settings and try again. See my answer to this question: Is VMWare causing my Linux host to lose network connectivity. Solution for IPv6Ī common cause is because of wrong IPv6 settings. Since this is the first post here I will explain that I have started working on a project and am going to use this blog to document progress and post various problems I run into with the solutions that worked for me. I would now assume either a missing route to the Internet or a problem with name resolution. Or just wait and mail will start to send. 'Network is unreachable' CentOS 6.2 as guest in VirtualBox. Re: SOLVED Network Unreachable at guest OS where host is running DNSmasq If you are able to ping the gateway from your VM, you do have access to your network. If you want to use IPv4 instead, then you should edit the Postfix configuration file: vi /etc/postfix/main.cfĪnd change inet_protocols = all to inet_protocols = ipv4 and restart or reload Postfix: /etc/init.d/postfix reload VM CentOS7 mini ping 115.239.211.112connect Network is unreachableip addr ip.

When trying to send email to a gmail account through postfix you can see an error like this in the postfix logs /var/log/maillog : Oct 13 17:49:54 solver postfix/smtp: connect to gmail-smtp-in.l.:25: Network is unreachable Solution for IPv4

Network is unreachable linux centos