Here's an odd one for you. I have a Fedora 19 box - GROUCHO - that is the DNS/DHCP/email/...... server for one of my LANs On there I have a home-grown network status monitor which pings a list of IP's and monitors the state, reporting anything that goes missing. The IP address of this host is 10.6.1.1/24 I also have a Centos 7 box - ZEPPO - on the same subnet/VLAN. This box is a file/print server. This box has two IP addresses 10,6.1.3/24 and 10.6.1.101/24 Groucho happily pings Zeppo on the 10.6.1.101 address. I have now added a USB WiFi dongle to Zeppo and configured it using nmtui. This is to put Zeppo onto the WiFi and enable Air Printing from IPads. All of this works perfectly fine, and no other devices have any issues - except groucho. If the WiFi link is up on Zeppo, Groucho cannot ping it. If the WiFi link is down on Zeppo, Groucho can ping it. As I say, the WiFi link state doesn not affect any other device, Linux or otherwise. Neither device have firewalling enabled (for this testing) and both devices have very simple routing tables. Even when Groucho cannot ping Zeppo, Zeppo can still ping Groucho --------------------------------------------------- [root@zeppo ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.6.1.254 0.0.0.0 UG 100 0 0 enp3s0 10.6.1.1 10.6.103.254 255.255.255.255 UGH 600 0 0 wlp0s26u1u2 10.6.1.3 0.0.0.0 255.255.255.255 UH 100 0 0 enp3s0 10.6.1.101 0.0.0.0 255.255.255.255 UH 100 0 0 enp3s0 10.6.1.254 0.0.0.0 255.255.255.255 UH 100 0 0 enp3s0 10.6.103.0 0.0.0.0 255.255.255.0 U 600 0 0 wlp0s26u1u2 [root@zeppo ~]# nmcli con up RW54254 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2) [root@zeppo ~]# --------------------------------------------------- [root@groucho ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.6.1.254 0.0.0.0 UG 0 0 0 p4p1 10.6.1.0 0.0.0.0 255.255.255.0 U 1 0 0 p4p1 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 p4p1 [root@groucho ~]# ping zeppo PING zeppo.ringways.co.uk (10.6.1.101) 56(84) bytes of data. >From groucho.ringways.co.uk (10.6.1.1) icmp_seq=1 Destination Host Unreachable >From groucho.ringways.co.uk (10.6.1.1) icmp_seq=2 Destination Host Unreachable >From groucho.ringways.co.uk (10.6.1.1) icmp_seq=3 Destination Host Unreachable >From groucho.ringways.co.uk (10.6.1.1) icmp_seq=4 Destination Host Unreachable ^C --- zeppo.ringways.co.uk ping statistics --- 5 packets transmitted, 0 received, +4 errors, 100% packet loss, time 4002ms pipe 4 [root@groucho ~]# --------------------------------------------------- [root@zeppo ~]# nmcli con down RW54254 Connection 'RW54254' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3) [root@zeppo ~]# --------------------------------------------------- [root@groucho ~]# ping zeppo PING zeppo.ringways.co.uk (10.6.1.101) 56(84) bytes of data. 64 bytes from zeppo.ringways.co.uk (10.6.1.101): icmp_seq=1 ttl=63 time=0.230 ms 64 bytes from zeppo.ringways.co.uk (10.6.1.101): icmp_seq=2 ttl=63 time=0.228 ms 64 bytes from zeppo.ringways.co.uk (10.6.1.101): icmp_seq=3 ttl=63 time=0.229 ms 64 bytes from zeppo.ringways.co.uk (10.6.1.101): icmp_seq=4 ttl=63 time=0.213 ms ^C --- zeppo.ringways.co.uk ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 2999ms rtt min/avg/max/mdev = 0.213/0.225/0.230/0.007 ms [root@groucho ~]# _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
