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An SSH connection could be disrupted, so you should have a fallback strategy. Make sure you have a way to login to the system in case the network interface becomes nonfunctional. One or both of these might work for your interface.
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Install the ethtool and net-tools packages, so that you have the ethtool and mii-tool programs.
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If you set your interface's speed and duplex by hand, then some trial and error may be required. For error-free operation if you set speed and duplex manually you must ensure that exactly the same speed and duplex are configured on the partner interface. If you turn off autonegotiation and set speed and duplex manually then the partner interface at the other end of the cable will assume that the absence of autonegotiation indicates a speed of 10Mbps and a duplex of half. # we may not enable ipv6 forwarding, otherwise SLAAC gets disabledĪutonegotiation repeatedly failing is often a symptom of faulty cabling, so investigate physical matters before assuming that the interfaces' autonegotiation algorithms are incompatible. # use SLAAC to get global IPv6 address from the router to use IPv6 SLAAC for internet connectivity and static addresses within the network:
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Mixing manual and automatic configuration is also possible, e.g. Make sure to disable all DHCP services, e.g. If you want to add an IPv6 address, too, append something like: If you're configuring it manually then something like this will set the default gateway (network, broadcast and gateway are optional): If you're just using DHCP then all you need is something like:įor DHCPv6 (used for IPv6), append also the following iface stanzaĪlternatively, IPv6 can be autoconfigured using stateless address autoconfiguration, or SLAAC, which is specified using auto instead of dhcp in the inet6 stanza: Using DHCP to automatically configure the interface
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Stretch and Buster still retain support for the old naming system as long as the file /etc/udev/rules.d/les is still in place, but users are advised to switch ahead of the upgrade to Bullseye. Various examples below continue to use "eth0" as a default interface name, even though it is unlikely to exist on a modern system. You can list interfaces with: ls /sys/class/net The new system uses names based on hardware location, like eno0, enp0s31f6, wlp1s7 (or in the case of USB dongles, MAC address: enx2c56ac39ec0d). Since Stretch, new systems by default no longer use old-style interface names such as eth0, eth1, wlan0, wlan1. bridge) in /etc/network/interfaces you can reinitialize the network-configuration be restarting the networking daemon: If you make more fundamental network changes e.g. Instead use ifup and ifdown to apply changes to each interface, for example with an interface named enp7s0: Some outdated guides instruct to restart the networking service to apply changes to /etc/network/interfaces, however this was deprecated because it is possible that not all interfaces will be restarted. Interfaces configured with /etc/network/interfaces can be brought up and down with the ifup and ifdown commands. Remember to add interfaces that you want brought up at boot time to the 'auto' line. Here, you can give your network card an IP address (or use dhcp), set up routing information, configure IP masquerading, set default routes and much more.
The majority of network setup can be done via the interfaces configuration file at /etc/network/interfaces. NetworkManager: This is the default for Laptop configuration
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How to set the MTU (Max transfer unit / packet size) with VLANS over a bonded interface.Howto create fault tolerant bonding with vlan (Etch - Stretch).Howto use vlan (dot1q, 802.1q, trunk) (Etch, Lenny).Bringing up an interface without an IP address.Using DHCP to automatically configure the interface.ģ, commonly used command: nmcli dev Show, you can view the MAC, IP, DNS and other information.
1, provided in two types Ubuntu network, a configuration tool is NetworkManager GUI, the other configuration is the command line, a two can coexist, that is arranged after one another become invalid Ģ, NetworkManager default is the desktop version will be installed by default in the server version is not available, use the command-line version.ģ, the difference between the two reference set: Ĥ, usually in the desktop version using GUI tools to set up, it would have a direct interface to NetworkManager is faster.ġ, for NetworkManager command-line tool is nm-tool (15.04+: nmcli), this tool lets you view IP, Gateway, DNS and so on.Ģ, but starting from Ubuntu 15.04, nm-tool has been absent, and instead it is nmcli.
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