Ubuntu24.04搭建PPPoE Server并进行拨号测试

本文主要记录如何搭建PPPoE Server，并进行拨号连接，并不包含PPPoE协议的细节。

本文在VMWare虚拟机Ubuntu24.04上搭建PPPoE Server，然后Windows10虚拟机通过PPPoE拨号获取IP，并进行上网。

拓扑搭建

本文PPPoE Server拨号实验所用设备：

能上外网的PC Win11（物理网卡：192.168.31.117，虚拟网卡：192.168.100.1）
Ubuntu24.04虚拟机：NAT模式网卡ens33用来上外网（192.168.100.128），仅主机模式网卡ens37（PPPoE拨号）
Windows10虚拟机：仅主机模式网卡Ethernet0。

具体拓扑如下图：

下面是用来进行拨号的虚拟网络配置：

其中VMnet8对应的虚拟机网卡ens33，VMnet2对应的虚拟机中的网卡为ens37。

Ubuntu24.04虚拟机配置：

blduan@ubuntu24:~$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.100.128  netmask 255.255.255.0  broadcast 192.168.100.255
        inet6 fe80::20c:29ff:fe74:4fda  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:74:4f:da  txqueuelen 1000  (Ethernet)
        RX packets 8316  bytes 1334191 (1.3 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7494  bytes 875930 (875.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens37: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::20c:29ff:fe74:4fe4  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:74:4f:e4  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 44  bytes 10892 (10.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 132  bytes 12279 (12.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 132  bytes 12279 (12.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

blduan@ubuntu24:~$ sudo cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        ens33:
            dhcp4: true
            optional: true
        ens37:
            dhcp4: true
            optional: true
    version: 2

Windows10虚拟机配置如下：

搭建PPPoE Server

安装PPPoE Server：sudo apt install pppoe。
配置PPPoE Server：（如果不存在pppoe-server-options则新建）

blduan@ubuntu24:~$ sudo cat /etc/ppp/pppoe-server-options
auth
require-chap
logfile /var/log/pppd.log
+ipv6

blduan@ubuntu24:~$ sudo cat /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client        server  secret                  IP addresses
123456 * 123456 *

配置端口转发：

blduan@ubuntu24:~$ sudo iptables -t nat -A POSTROUTING -s 192.168.84.0/24 -o ens33 -j MASQUERADE
blduan@ubuntu24:~$ sudo iptables -t nat -S
-P PREROUTING ACCEPT
-P INPUT ACCEPT
-P OUTPUT ACCEPT
-P POSTROUTING ACCEPT
-N DOCKER
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s 172.17.0.0/16 ! -o docker0 -j MASQUERADE
-A POSTROUTING -s 192.168.84.0/24 -o ens33 -j MASQUERADE
-A DOCKER -i docker0 -j RETURN

启动PPPoE Server：sudo pppoe-server -I ens37 -L 192.168.84.1 -R 192.168.84.2 -N 5

Windows10进行拨号

PPPoE拨号：

Windows10拨号结果：

重新配置DNS服务器为192.168.31.1，然后ping baidu.com验证网络连接：

Ubuntu24.04响应拨号

新增了一个ppp0接口，用于建立和Windows之间的连接

blduan@ubuntu24:~$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.100.128  netmask 255.255.255.0  broadcast 192.168.100.255
        inet6 fe80::20c:29ff:fe74:4fda  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:74:4f:da  txqueuelen 1000  (Ethernet)
        RX packets 12621  bytes 1717259 (1.7 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11501  bytes 1417043 (1.4 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens37: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::20c:29ff:fe74:4fe4  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:74:4f:e4  txqueuelen 1000  (Ethernet)
        RX packets 322  bytes 33544 (33.5 KB)
        RX errors 0  dropped 132  overruns 0  frame 0
        TX packets 227  bytes 44714 (44.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 132  bytes 12279 (12.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 132  bytes 12279 (12.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1480
        inet 192.168.84.1  netmask 255.255.255.255  destination 192.168.84.5
        inet6 fe80::403a:cc9b:6ace:db0f  prefixlen 128  scopeid 0x20<link>
        ppp  txqueuelen 3  (Point-to-Point Protocol)
        RX packets 41  bytes 3618 (3.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 38  bytes 7369 (7.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
blduan@ubuntu24:~$ ps -aux | grep ppp
root        2166  0.0  0.0   2724  1152 ?        S    16:25   0:00 pppoe-server -I ens37 -L 192.168.84.1 -R 192.168.84.2 -N 5
root        2290  0.0  0.0  14768  6016 ?        Ss   16:39   0:00 pppd pty /usr/sbin/pppoe -n -I ens37 -e 1:00:0c:29:72:32:e3 -S '' file /etc/ppp/pppoe-server-options 192.168.84.1:192.168.84.2 nodetach noaccomp nopcomp default-asyncmap mru 1492 mtu 1492