我有一个带 PON 端口（光纤）和 RJ45 端口的调制解调器。在 Windows 上，我能够拨号连接到互联网，而无需更改调制解调器上的任何默认设置。
在 Ubuntu 22.04 上，我尝试运行 pppoeconf。执行后，普罗格显示以下输出：
plog
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: local LL address fe80::80c3:5152:b2ce:92b6
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: remote LL address fe80::f263:f9ff:fe16:d620
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: replacing old default route to eno1 [192.168.1.91]
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: local IP address 20.0.1.172
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: remote IP address 20.0.0.1
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: primary DNS address 45.116.2.238
Jul 26 22:13:27 ram-S1200RP-SE pppd[103311]: secondary DNS address 8.8.8.8
sudo ip -d 地址 ls显示以下内容：
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:1e:67:d7:f6:0c brd ff:ff:ff:ff:ff:ff
altname enp3s0
inet 192.168.1.68/24 brd 192.168.1.255 scope global eno1
valid_lft forever preferred_lft forever
inet6 fe80::21e:67ff:fed7:f60c/64 scope link
valid_lft forever preferred_lft forever
3: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 00:1e:67:d7:f6:0d brd ff:ff:ff:ff:ff:ff
inet6 fe80::21e:67ff:fed7:f60d/64 scope link
valid_lft forever preferred_lft forever
29: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc fq_codel state UNKNOWN group default qlen 3
link/ppp
inet 20.0.1.172 peer 20.0.0.1/32 scope global ppp0
valid_lft forever preferred_lft forever
inet6 fe80::80c3:5152:b2ce:92b6 peer fe80::f263:f9ff:fe16:d620/128 scope link
valid_lft forever preferred_lft forever
/etc/网络/接口文件被 pppoeconf 修改为：
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source /etc/network/interfaces.d/*
iface dsl-provider inet ppp
pre-up /bin/ip link set eno1 up # line maintained by pppoeconf
provider dsl-provider
auto eno1
iface eno1 inet manual
我使用 /etc/systemd/network 文件夹来配置我的网络。我在其中创建的 20-static.network 文件是：
[Match]
MACAddress=00:1e:67:d7:f6:0c
[Network]
Address=192.168.1.68/24
DNS=8.8.8.8
DNS=8.8.4.4
我无法 ping 到 8.8.8.8 或任何其他外部 IP。如果我将网关地址条目替换为 ISP 为我提供的一些静态 IP 地址的另一个 IP 地址，那么我可以 ping 到任何地址。是的，调制解调器的 IP 地址（默认）设置为 192.168.1.1。
让它工作起来真是令人沮丧。任何帮助都将不胜感激。
根据答案和评论进行编辑：
根据评论，我删除了 en01 的网关条目。
路线命令现在显示：
Destination Gateway Genmask Flags Metric Ref Use Iface
default 0.0.0.0 0.0.0.0 U 0 0 0 ppp0
20.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eno1
我尝试通过首先设置 eno1 以通过交换机连接到正确路由的路由器来 ping 并检查 tcpdump。
ping 8.8.8.8 -i 5 -c 2
sudo tcpdump -ni eno1 #In another window
12:18:16.008892 IP 192.168.1.68 > 8.8.8.8: ICMP echo request, id 6, seq 1, length 64
12:18:16.024989 IP 8.8.8.8 > 192.168.1.68: ICMP echo reply, id 6, seq 1, length 64
12:18:21.014143 IP 192.168.1.68 > 8.8.8.8: ICMP echo request, id 6, seq 2, length 64
12:18:21.030392 IP 8.8.8.8 > 192.168.1.68: ICMP echo reply, id 6, seq 2, length 64
然后我将电缆从 eno1 切换回调制解调器，这是我 ping 8.8.8.8 时 tcpdump 的输出
ping 8.8.8.8 -i 5 -c 2
sudo tcpdump -ni ppp0 #In another window
12:30:51.504465 IP 20.0.2.75 > 8.8.8.8: ICMP echo request, id 9, seq 1, length 64
12:30:56.757509 IP 20.0.2.75 > 8.8.8.8: ICMP echo request, id 9, seq 2, length 64
我没有收到 ICMP 回复。
根据以下情况，调制解调器连接似乎正常：
tail -200 /var/log/syslog|grep pppd
Jul 27 12:28:03 ram-S1200RP-SE pppd[5452]: Connect: ppp0 <--> eno1
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: Remote message: Authentication success,Welcome!
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: PAP authentication succeeded
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: peer from calling number F0:63:F9:16:D6:20 authorized
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: local LL address fe80::1c37:674c:4463:8995
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: remote LL address fe80::f263:f9ff:fe16:d620
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: local IP address 20.0.2.75
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: remote IP address 20.0.0.1
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: primary DNS address 45.116.2.238
Jul 27 12:28:06 ram-S1200RP-SE pppd[5452]: secondary DNS address 8.8.8.8
有什么指点吗？
答案1
使用 PPPoE 时，调制解调器不是您的网关，您不应将其配置为网关。调制解调器，即使是路由器，本身也没有任何互联网连接，因此它无法对您的数据包进行任何处理。
换句话说，您应该拥有的唯一默认路由是通过 ppp0 隧道接口的路由 - 而不是直接通过以太网的路由。