系统：ubuntu 18.04LTS
问题：pppoe拨号后无法上网
排查过程
代码： 全选
xavier@xavier-desktop:~$ uname -a
Linux xavier-desktop 4.9.253-tegra #1 SMP PREEMPT Mon Jul 26 12:19:28 PDT 2021 aarch64 aarch64 aarch64 GNU/Linux
xavier@xavier-desktop:~$ sudo lspci
[sudo] password for xavier:
0001:00:00.0 PCI bridge: NVIDIA Corporation Device 1ad2 (rev a1)
0001:01:00.0 SATA controller: Marvell Technology Group Ltd. Device 9171 (rev 13)
xavier@xavier-desktop:~$ sudo lshw -class network
*-network:0
description: Ethernet interface
physical id: 3
logical name: dummy0
serial: da:2d:76:7c:65:48
capabilities: ethernet physical
configuration: broadcast=yes driver=dummy driverversion=1.0
*-network:1
description: Ethernet interface
physical id: 4
logical name: eth0
serial: 00:04:4b:e5:92:51
size: 1Gbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=eqos duplex=full ip=172.24.69.126 link=yes multicast=yes port=MII speed=1Gbit/s
*-network:2
description: Ethernet interface
physical id: 5
logical name: usb0
serial: 0e:bd:bc:78:86:a3
capabilities: ethernet physical
configuration: broadcast=yes driver=g_ether driverversion=29-May-2008 firmware=tegra-xudc link=no multicast=yes
*-network:3
description: Ethernet interface
physical id: 6
logical name: rndis0
serial: 0e:bd:bc:78:86:a1
capabilities: ethernet physical
configuration: broadcast=yes driver=g_ether driverversion=29-May-2008 firmware=tegra-xudc link=no multicast=yes
xavier@xavier-desktop:~$ sudo ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
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: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether da:2d:76:7c:65:48 brd ff:ff:ff:ff:ff:ff
inet6 fe80::d82d:76ff:fe7c:6548/64 scope link
valid_lft forever preferred_lft forever
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:04:4b:e5:92:51 brd ff:ff:ff:ff:ff:ff
inet 172.24.69.126/21 brd 172.24.71.255 scope global dynamic noprefixroute eth0
valid_lft 14185sec preferred_lft 14185sec
inet6 2403:ac00:0:4001::3:8a35/128 scope global dynamic noprefixroute
valid_lft 258995sec preferred_lft 172595sec
inet6 fe80::6aba:5950:87f7:30c1/64 scope link noprefixroute
valid_lft forever preferred_lft forever
4: l4tbr0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 0e:bd:bc:78:86:a1 brd ff:ff:ff:ff:ff:ff
5: rndis0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master l4tbr0 state DOWN group default qlen 1000
link/ether 0e:bd:bc:78:86:a1 brd ff:ff:ff:ff:ff:ff
6: usb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master l4tbr0 state DOWN group default qlen 1000
link/ether 0e:bd:bc:78:86:a3 brd ff:ff:ff:ff:ff:ff
8: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:d7:04:f9:9e brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
181: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN group default qlen 3
link/ppp
inet 172.26.13.114 peer 172.26.0.1/32 scope global ppp0
valid_lft forever preferred_lft forever
xavier@xavier-desktop:~$ ethtool -i eth0
driver: eqos
version:
firmware-version:
expansion-rom-version:
bus-info: 2490000.ether_qos
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
xavier@xavier-desktop:~$ 
，但是之前连接成功过一次，也能正常上网，重启之后就一直连接不上了。求问大佬们问题出在哪里了，已经试了一天了还没连上