With all the NICs active, I lose the connection
by WhiteTiger from LinuxQuestions.org on (#5QTC9)
I have a server with 3 NICs, connected to 3 switches. There are no VLANs.
On these 3 switches there are connected the 3 network cards of a firewall that provides 3 DHCP.
To the server I connect via SSH with a PC in network # 1 to the NIC of the server corresponding to network # 3.
After about a minute I lose the connection.
If I disable the server NIC on network # 1, the problem is not there.
I tried to replace the switches and also to swap the cables, but the problem returns. So it is not related to eno1.
There seems to be no errors in Syslog.
If I connect to the server with a GUI, I lose the connection, but then it is restored and then I lose it again after a short time. So, it is therefore an intermittent problem.
This is the interfaces file.
If I comment the eno1 line with DHCP and uncomment the one with "manual" there are no more interruptions.
Thanks in advance for any help.
Code:source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
# LAN
auto eno1
iface eno1 inet dhcp
#iface eno1 inet manual
# DMZ2
auto eno2
iface eno2 inet dhcp
# DMZ3
auto eno3
iface eno3 inet dhcp
On these 3 switches there are connected the 3 network cards of a firewall that provides 3 DHCP.
To the server I connect via SSH with a PC in network # 1 to the NIC of the server corresponding to network # 3.
After about a minute I lose the connection.
If I disable the server NIC on network # 1, the problem is not there.
I tried to replace the switches and also to swap the cables, but the problem returns. So it is not related to eno1.
There seems to be no errors in Syslog.
If I connect to the server with a GUI, I lose the connection, but then it is restored and then I lose it again after a short time. So, it is therefore an intermittent problem.
This is the interfaces file.
If I comment the eno1 line with DHCP and uncomment the one with "manual" there are no more interruptions.
Thanks in advance for any help.
Code:source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
# LAN
auto eno1
iface eno1 inet dhcp
#iface eno1 inet manual
# DMZ2
auto eno2
iface eno2 inet dhcp
# DMZ3
auto eno3
iface eno3 inet dhcp