我正在尝试连接到运行的 Ubuntu 服务器ssh（我们称之为）的嵌入式 Linux 设备（我们称之为）。并通过直接以太网电缆和串行 UART 连接。我可以使用串行终端 ( ) 连接到设备，但超时。我也无法使用该设备。所以，我相信这是两件事之一：petalinux22.04oippetalinuxoipminicomsshping
- 网络设置不兼容（子网掩码、网关等），或者
- 嵌入式 Linux 设备上的防火墙不允许流量通过。
为了检查第一个，我尝试查找oip;的 IP 地址。但是，我没有看到与以下相关的 IPv4 eno1：
编辑（添加 ifconfig、arp、netstat 和 ip Route 的输出）
$ ip addr
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 fq_codel state UP group default qlen 1000
link/ether cc:48:3a:66:a3:b3 brd ff:ff:ff:ff:ff:ff
altname enp0s31f6
inet6 fe80::91fe:23e9:430c:4c90/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:5d:96:04 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: wlp60s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 18:47:3d:31:82:dd brd ff:ff:ff:ff:ff:ff
inet 192.168.29.146/24 brd 192.168.29.255 scope global dynamic noprefixroute wlp60s0
valid_lft 40510sec preferred_lft 40510sec
inet6 2405:201:d001:8b9b:6aa1:628a:c18a:852c/64 scope global temporary dynamic
valid_lft 4186sec preferred_lft 4186sec
inet6 2405:201:d001:8b9b:9fbf:f0f:d3d4:34f5/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 4186sec preferred_lft 4186sec
inet6 fe80::8d6c:7a7c:f242:2c67/64 scope link noprefixroute
valid_lft forever preferred_lft forever
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:0c:f4:0a:c5 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
6: br-71e276fedf6f: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:93:94:0b:70 brd ff:ff:ff:ff:ff:ff
inet 172.19.0.1/16 brd 172.19.255.255 scope global br-71e276fedf6f
valid_lft forever preferred_lft forever
$ ifconfig -a
br-71e276fedf6f: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.19.0.1 netmask 255.255.0.0 broadcast 172.19.255.255
ether 02:42:93:94:0b:70 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:0c:f4:0a:c5 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether cc:48:3a:66:a3:b3 txqueuelen 1000 (Ethernet)
RX packets 12827 bytes 1018633 (1.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3854 bytes 679852 (679.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xed700000-ed720000
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 31692 bytes 4654677 (4.6 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 31692 bytes 4654677 (4.6 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:5d:96:04 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp60s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.29.146 netmask 255.255.255.0 broadcast 192.168.29.255
inet6 fe80::8d6c:7a7c:f242:2c67 prefixlen 64 scopeid 0x20<link>
inet6 2405:201:d001:8b9b:9fbf:f0f:d3d4:34f5 prefixlen 64 scopeid 0x0<global>
inet6 2405:201:d001:8b9b:2e48:2aca:eaf7:f31b prefixlen 64 scopeid 0x0<global>
ether 18:47:3d:31:82:dd txqueuelen 1000 (Ethernet)
RX packets 7661151 bytes 11185482986 (11.1 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2146363 bytes 514484076 (514.4 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
$ arp -an
? (192.168.29.73) at 5c:e9:1e:9c:3a:b0 [ether] on wlp60s0
? (192.168.29.1) at a8:da:0c:c0:06:48 [ether] on wlp60s0
$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.29.1 0.0.0.0 UG 0 0 0 wlp60s0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 virbr0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.19.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-71e276fedf6f
192.168.29.0 0.0.0.0 255.255.255.0 U 0 0 0 wlp60s0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
$ ip route
default via 192.168.29.1 dev wlp60s0 proto dhcp metric 600
169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
172.19.0.0/16 dev br-71e276fedf6f proto kernel scope link src 172.19.0.1 linkdown
192.168.29.0/24 dev wlp60s0 proto kernel scope link src 192.168.29.146 metric 600
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
方面则oip更为ip addr直接。在这里，我已经eth0静态设置了IP。
编辑（添加 ifconfig、arp、netstat 和 ip Route 的输出）
$ ip addr
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: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
3: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether a6:e6:68:9d:46:5f brd ff:ff:ff:ff:ff:ff
inet 192.168.0.10/24 brd 192.168.0.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::a4e6:68ff:fe9d:465f/64 scope link
valid_lft forever preferred_lft forever
$ ifconfig -a
can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:47
eth0 Link encap:Ethernet HWaddr A6:E6:68:9D:46:5F
inet addr:192.168.0.10 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::a4e6:68ff:fe9d:465f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:77 errors:0 dropped:0 overruns:0 frame:0
TX packets:692 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17852 (17.4 KiB) TX bytes:54248 (52.9 KiB)
Interrupt:48
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:626 errors:0 dropped:0 overruns:0 frame:0
TX packets:626 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:56300 (54.9 KiB) TX bytes:56300 (54.9 KiB)
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
$ arp -an
-sh: arp: command not found
$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
$ ip route
default via 192.168.0.1 dev eth0 proto static
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.10
另外，SSH服务器是通过命令检查，在设备上运行sudo systemctl status sshd。最终目标是调试为什么我无法ping或无法ssh访问设备。
答案1
192.168.0.10/24 已设置petalinux的以太网0链接到奥伊普的诺1，为了允许 oip 和 petalinux 之间的通信，请在奥伊普（作为根用户，这意味着它可能应该以sudo) 开头：
ip addr add 192.168.0.11/24 dev eno1
就是这样：现在每个人都应该能够使用对方的 IP 地址访问对方：192.168.0.10 或 192.168.0.11（两者都在 192.168.0.0/24 内）。除了多余的信息（libvirt 和 Docker 也在运行）之外，我在这里没有看到任何奇怪的问题。
笔记：petalinux无法直接从 PC 访问（在评论）也不能通过奥伊普至少有两个原因：Ubuntu 的 Docker 将 filter/FORWARD 设置为 DROP，并且 PC 可能没有足够的路由到 192.168.0.0/24。但这不是问题的一部分。