Networking: Difference between revisions

From LinuxizeNet
(Create Networking hub page)
 
(Add the two router howtos)
 
Line 1: Line 1:
__NOTOC__
__NOTOC__
Networking notes — switches, routers, DNS, TLS and the things that only break
Networking notes — routers, switches, DNS, TLS and the things that only break
once a year.
once a year.
== Linux router ==
<div class="lz-cardgrid">
{{Card|page=Linux router with WAN, LAN and DMZ|desc=IP forwarding on and off, interfaces in systemd-networkd, and a default-deny iptables policy publishing a mail and a web server from the DMZ.|cmd=net.ipv4.ip_forward=1}}
{{Card|page=DHCP and NTP for the LAN with systemd-networkd|title=DHCP and NTP for the LAN|desc=Serve addresses from the router and push it as the LAN's NTP source.|cmd=EmitNTP=yes}}
</div>


== Cisco ==
== Cisco ==

Latest revision as of 21:57, 9 August 2026

Networking notes — routers, switches, DNS, TLS and the things that only break once a year.

Linux router[edit]

Linux router with WAN, LAN and DMZ
IP forwarding on and off, interfaces in systemd-networkd, and a default-deny iptables policy publishing a mail and a web server from the DMZ.
net.ipv4.ip_forward=1
DHCP and NTP for the LAN
Serve addresses from the router and push it as the LAN's NTP source.
EmitNTP=yes

Cisco[edit]

SYS-4-CONFIG_RESOLVE_FAILURE
What the log message means and how to stop it.
no ip domain-lookup

Certificates[edit]

Self-Signed CA
Run your own CA with mkcert and get every box on the LAN to trust it.
mkcert -install