Hi all, I have network issue, I can access centos 7 x64 host only if I start ping. If ping is off host is not accesable on any port. If I first ping Host then evrything works, HTTP, ssh, telnet.
It's a local network, internet is working, firewalld is disabled, selinux disabled.
There is only 2 hosts have eccess without ping, my dns server and gateway host.
This two hosts listed in network config and I think this is a reason why they have access without ping.
Thank you in advance.
Can access host only if I PING
-
- Posts: 2019
- Joined: 2015/02/17 15:14:33
- Location: Bulgaria
- Contact:
Re: Can access host only if I PING
This sounds like your switch's CAM table gets empty, and once you ping, the switch broadcasts the ICMP echo request on all ports and once the CentOS 7 responds - you get your connection requests properly.
This is just a guess.
In order to verify that, run tcpdump on the CentOS and then try to connect via ssh/http or any other service on your CentOS. If the CentOS doesn't respond , but a package is received you have to check local firewall and ignore my "guess".
This is just a guess.
In order to verify that, run tcpdump on the CentOS and then try to connect via ssh/http or any other service on your CentOS. If the CentOS doesn't respond , but a package is received you have to check local firewall and ignore my "guess".
Re: Can access host only if I PING
Also post the ifcfg file for the interface from your CentOS box as the networking is meant to use arp to tell the switch it exists as it boots.
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke