Ubuntu networking: Difference between revisions
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[[ | [[Category:Ubuntu|Networking]] | ||
[[ | [[Category:Linux|Networking]] | ||
==Disable IPv6== | ==Disable IPv6== | ||
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net.ipv6.conf.default.disable_ipv6 = 1 | net.ipv6.conf.default.disable_ipv6 = 1 | ||
net.ipv6.conf.lo.disable_ipv6 = 1 | net.ipv6.conf.lo.disable_ipv6 = 1 | ||
</ | </syntaxhighlight> | ||
===Activate /etc/sysctl.d/60-disable-ipv6.conf=== | ===Activate /etc/sysctl.d/60-disable-ipv6.conf=== | ||
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net.ipv6.conf.default.disable_ipv6 = 1 | net.ipv6.conf.default.disable_ipv6 = 1 | ||
net.ipv6.conf.lo.disable_ipv6 = 1 | net.ipv6.conf.lo.disable_ipv6 = 1 | ||
</ | </syntaxhighlight> | ||
===Check settings=== | ===Check settings=== | ||
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# cat /proc/sys/net/ipv6/conf/all/disable_ipv6 | # cat /proc/sys/net/ipv6/conf/all/disable_ipv6 | ||
1 | 1 | ||
</ | </syntaxhighlight> | ||
==The ip command== | ==The ip command== | ||
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# mygateway=172.16.78.1 | # mygateway=172.16.78.1 | ||
# declare -a mynameservers=( 172.16.77.4 172.16.79.4 ) | # declare -a mynameservers=( 172.16.77.4 172.16.79.4 ) | ||
</ | </syntaxhighlight> | ||
Create the bonding interface out of the two masters | Create the bonding interface out of the two masters | ||
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# ip link set ${mymaster2} down | # ip link set ${mymaster2} down | ||
# ip link set ${mymaster2} master ${myinterface} | # ip link set ${mymaster2} master ${myinterface} | ||
</ | </syntaxhighlight> | ||
If you want to add a VLAN to your interface | If you want to add a VLAN to your interface | ||
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# ip link add link ${myinterface} name ${myinterface}.${myvlan} type vlan id ${myvlan} | # ip link add link ${myinterface} name ${myinterface}.${myvlan} type vlan id ${myvlan} | ||
# myinterface=${myinterface}.${myvlan} | # myinterface=${myinterface}.${myvlan} | ||
</ | </syntaxhighlight> | ||
Bring your interface up and set yout ip address | Bring your interface up and set yout ip address | ||
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# ip link set ${myinterface} up | # ip link set ${myinterface} up | ||
# ip addr add ${myipaddr} dev ${myinterface} | # ip addr add ${myipaddr} dev ${myinterface} | ||
</ | </syntaxhighlight> | ||
Set your default gateway and DNS | Set your default gateway and DNS | ||
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# ip route add default via ${mygateway} | # ip route add default via ${mygateway} | ||
# if (( ${#mynameservers[*]} > 1 )) ; then eval systemd-resolve --interface ${myinterface} --set-dns={$(IFS=,; printf '%s' "${mynameservers[*]}")} ; else eval systemd-resolve --interface ${myinterface} --set-dns=${mynameservers[0]} ; fi | # if (( ${#mynameservers[*]} > 1 )) ; then eval systemd-resolve --interface ${myinterface} --set-dns={$(IFS=,; printf '%s' "${mynameservers[*]}")} ; else eval systemd-resolve --interface ${myinterface} --set-dns=${mynameservers[0]} ; fi | ||
</ | </syntaxhighlight> | ||
===ipa=== | ===ipa=== | ||
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<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
# ip a | # ip a | ||
</ | </syntaxhighlight> | ||
shows you the configured addresses. | shows you the configured addresses. | ||
It is the short cut for "ip address show". | It is the short cut for "ip address show". | ||
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<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
# ip li sh up | # ip li sh up | ||
</ | </syntaxhighlight> | ||
shows you all links (interfaces) that are up. | shows you all links (interfaces) that are up. | ||
This is short for "ip link show up". | This is short for "ip link show up". | ||
| Line 92: | Line 92: | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
# netplan appy | # netplan appy | ||
</ | </syntaxhighlight> | ||
Keep in mind: You might lose your connection depending on the changes made! | Keep in mind: You might lose your connection depending on the changes made! | ||
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dhcp4: yes | dhcp4: yes | ||
version: 2 | version: 2 | ||
</ | </syntaxhighlight> | ||
====Bonding==== | ====Bonding==== | ||
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- "192.168.3.60" | - "192.168.3.60" | ||
- "192.168.3.61" | - "192.168.3.61" | ||
</ | </syntaxhighlight> | ||
Latest revision as of 01:26, 26 November 2021
Disable IPv6
Create /etc/sysctl.d/60-disable-ipv6.conf
Create a file named /etc/sysctl.d/60-disable-ipv6.conf with this content:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
Activate /etc/sysctl.d/60-disable-ipv6.conf
# sysctl -p /etc/sysctl.d/10-disable-ipv6.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
Check settings
# cat /proc/sys/net/ipv6/conf/all/disable_ipv6
1
The ip command
Configure bond manually
Specify your environment
# mymaster1=eno5
# mymaster2=eno6
# myinterface=bond007
# myipaddr=172.16.78.9/24
# mygateway=172.16.78.1
# declare -a mynameservers=( 172.16.77.4 172.16.79.4 )
Create the bonding interface out of the two masters
# ip link add ${myinterface} type bond
# ip link set ${myinterface} type bond miimon 100 mode active-backup
# ip link set ${mymaster1} down
# ip link set ${mymaster1} master ${myinterface}
# ip link set ${mymaster2} down
# ip link set ${mymaster2} master ${myinterface}
If you want to add a VLAN to your interface
# myvlan=1234
# ip link add link ${myinterface} name ${myinterface}.${myvlan} type vlan id ${myvlan}
# myinterface=${myinterface}.${myvlan}
Bring your interface up and set yout ip address
# ip link set ${myinterface} up
# ip addr add ${myipaddr} dev ${myinterface}
Set your default gateway and DNS
# ip route add default via ${mygateway}
# if (( ${#mynameservers[*]} > 1 )) ; then eval systemd-resolve --interface ${myinterface} --set-dns={$(IFS=,; printf '%s' "${mynameservers[*]}")} ; else eval systemd-resolve --interface ${myinterface} --set-dns=${mynameservers[0]} ; fi
ipa
This is not only indian pale ale! On linux
# ip a
shows you the configured addresses. It is the short cut for "ip address show".
iplishup
This just sounds like a word and helps you to keep it in mind.
# ip li sh up
shows you all links (interfaces) that are up. This is short for "ip link show up".
New since Ubuntu 17.10
netplan
Former configuration in /etc/network/interfaces{,.d} is now found in /etc/netplan in YAML syntax. The name of the file is /etc/netplan/<whatever you want, I prefer the interface name>.yaml . The .yaml at the end is not optional!
netplan <command>
To apply changes to your files in /etc/netplan without reboot use:
# netplan appy
Keep in mind: You might lose your connection depending on the changes made!
DHCP
/etc/netplan/ens160.yaml
network:
ethernets:
ens160:
dhcp4: yes
version: 2
Bonding
/etc/netplan/bond007.yaml
network:
version: 2
renderer: networkd
ethernets:
slave1:
match:
macaddress: "3c:a7:2a:22:af:70"
dhcp4: no
slave2:
match:
macaddress: "3c:a7:2a:22:af:71"
dhcp4: no
bonds:
bond007:
interfaces:
- slave1
- slave2
parameters:
mode: balance-rr
mii-monitor-interval: 10
dhcp4: no
addresses:
- 192.168.189.202/27
gateway4: 192.168.189.193
nameservers:
search:
- mcs.de
addresses:
- "192.168.3.60"
- "192.168.3.61"
