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5d04b5 Jannik Eckhardt 2026-04-26 10:23:19
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# Alpine Router
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Alpine linux NAT router mit iptables und dnsmasq für privates Netzwerk mit DNS und DHCP.
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Als Basis werden eth0 als WAN und eth1 als LAN1 eingerichtet.
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für
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--------------------Beispiel `/etc/network/interfaces`---------------
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```
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auto eth0
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iface eth0 inet dhcp
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auto eth1
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iface eth1 inet static
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address 192.168.1.2
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netmask 255.255.255.0
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( auto eth2
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iface eth2 inet static
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address 192.168.2.2
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netmask 255.255.255.0
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.
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.
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. )
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```
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---------------------------------------------------------------------
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```sh
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#!/bin/sh
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# script iptables.sh
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apk add iptables
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rc-update add iptables
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echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
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iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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iptables -A FORWARD -i eth1 -j ACCEPT
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/etc/init.d/iptables save
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#/sbin/reboot
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```
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---------------------------------------------------------------------
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```sh
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#!/bin/sh
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# script dnsmasq.sh
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apk add dnsmasq
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rc-update add dnsmasq
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# interface - interface to listen for DHCP and DNS requests
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# domain - domain for the private network
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# dhcp_range - lower bound, upper bound, lease timeout
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interface=eth1
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domain=example.com
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dhcp_range="192.168.1.100,192.168.1.254,12h"
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sed -i \
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"s/^#\?\(interface=\).*/\1$interface/; \
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s/^#\(listen-address\)=.*/\1=127.0.0.1/; \
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s/^#\(expand-hosts\)/\1/; \
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s/^#\?\(domain=\)[^,]*$/\1$domain/; \
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s/^#\?\(dhcp-range=\)\d\{1,3\}.\d\{1,3\}.\d\{1,3\}.\d\{1,3\},\d\{1,3\}.\d\{1,3\}.\d\{1,3\}.\d\{1,3\},[^,]*$/\1$dhcp_range/" \
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/etc/dnsmasq.conf
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#/sbin/reboot
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```
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static ip, nameserver resolf.conf
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add nameserver 8.8.8.8
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--------------------------------------------------------------------
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`apk add util-linux`
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zur Funktionserweiterung von dmesg, sonst kein -T etc.