sudo iptables-保存

sudo iptables-保存

我有一台 Ubuntu 服务器,无法从外部机器访问该服务器。我尝试通过 ssh 连接到 Ubuntu 机器,但似乎所有请求都被搁置或未到达。我没有设置任何特殊路由或 IP 配置。

子网如下所示:

        router
           |
  ---------+--------------------
  |        |         |         |
Ubuntu  raspberry  raspberry raspberry

首先,我通过 vpn 进入网络,然后我想登录到我的 Ubuntu 机器,但我无法这样做,所以我尝试访问树莓派,当我看到我可以进入树莓派时,我尝试从树莓派 ssh 到我的 Ubuntu 服务器,并且成功了。

从路由器我可以看到所有的机器。

有人可以帮助我访问我的 Ubuntu 服务器,而无需访问第一个树莓派吗?

sudo iptables-保存

# Generated by iptables-save v1.8.4 on Fri Sep 11 07:58:24 2020
*nat
:PREROUTING ACCEPT [60337:4082282]
:INPUT ACCEPT [5:300]
:OUTPUT ACCEPT [4920:342818]
:POSTROUTING ACCEPT [4920:342818]
:OUTPUT_direct - [0:0]
:POSTROUTING_ZONES - [0:0]
:POSTROUTING_direct - [0:0]
:POST_public - [0:0]
:POST_public_allow - [0:0]
:POST_public_deny - [0:0]
:POST_public_log - [0:0]
:POST_public_post - [0:0]
:POST_public_pre - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A POSTROUTING -j POSTROUTING_ZONES
-A POSTROUTING_ZONES -o eno1 -g POST_public
-A POSTROUTING_ZONES -g POST_public
-A POST_public -j POST_public_pre
-A POST_public -j POST_public_log
-A POST_public -j POST_public_deny
-A POST_public -j POST_public_allow
-A POST_public -j POST_public_post
-A PREROUTING_ZONES -i eno1 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
# Completed on Fri Sep 11 07:58:24 2020
# Generated by iptables-save v1.8.4 on Fri Sep 11 07:58:24 2020
*mangle
:PREROUTING ACCEPT [78641:5937844]
:INPUT ACCEPT [78611:5935350]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [46644:3913664]
:POSTROUTING ACCEPT [46670:3916660]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
:POSTROUTING_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A PREROUTING_ZONES -i eno1 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
# Completed on Fri Sep 11 07:58:24 2020
# Generated by iptables-save v1.8.4 on Fri Sep 11 07:58:24 2020
*raw
:PREROUTING ACCEPT [78642:5937896]
:OUTPUT ACCEPT [46646:3914420]
:OUTPUT_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
:PRE_public_post - [0:0]
:PRE_public_pre - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A PREROUTING_ZONES -i eno1 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_pre
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public -j PRE_public_post
COMMIT
# Completed on Fri Sep 11 07:58:24 2020
# Generated by iptables-save v1.8.4 on Fri Sep 11 07:58:24 2020
*security
:INPUT ACCEPT [19038:1906726]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [47400:3969196]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
COMMIT
# Completed on Fri Sep 11 07:58:24 2020
# Generated by iptables-save v1.8.4 on Fri Sep 11 07:58:24 2020
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [30649:2765745]
:FORWARD_IN_ZONES - [0:0]
:FORWARD_OUT_ZONES - [0:0]
:FORWARD_direct - [0:0]
:FWDI_public - [0:0]
:FWDI_public_allow - [0:0]
:FWDI_public_deny - [0:0]
:FWDI_public_log - [0:0]
:FWDI_public_post - [0:0]
:FWDI_public_pre - [0:0]
:FWDO_public - [0:0]
:FWDO_public_allow - [0:0]
:FWDO_public_deny - [0:0]
:FWDO_public_log - [0:0]
:FWDO_public_post - [0:0]
:FWDO_public_pre - [0:0]
:INPUT_ZONES - [0:0]
:INPUT_direct - [0:0]
:IN_public - [0:0]
:IN_public_allow - [0:0]
:IN_public_deny - [0:0]
:IN_public_log - [0:0]
:IN_public_post - [0:0]
:IN_public_pre - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED,DNAT -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED,DNAT -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -j OUTPUT_direct
-A FORWARD_IN_ZONES -i eno1 -g FWDI_public
-A FORWARD_IN_ZONES -g FWDI_public
-A FORWARD_OUT_ZONES -o eno1 -g FWDO_public
-A FORWARD_OUT_ZONES -g FWDO_public
-A FWDI_public -j FWDI_public_pre
-A FWDI_public -j FWDI_public_log
-A FWDI_public -j FWDI_public_deny
-A FWDI_public -j FWDI_public_allow
-A FWDI_public -j FWDI_public_post
-A FWDI_public -p icmp -j ACCEPT
-A FWDO_public -j FWDO_public_pre
-A FWDO_public -j FWDO_public_log
-A FWDO_public -j FWDO_public_deny
-A FWDO_public -j FWDO_public_allow
-A FWDO_public -j FWDO_public_post
-A INPUT_ZONES -i eno1 -g IN_public
-A INPUT_ZONES -g IN_public
-A IN_public -j IN_public_pre
-A IN_public -j IN_public_log
-A IN_public -j IN_public_deny
-A IN_public -j IN_public_allow
-A IN_public -j IN_public_post
-A IN_public -p icmp -j ACCEPT
-A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW,UNTRACKED -j ACCEPT
COMMIT
# Completed on Fri Sep 11 07:58:24 2020

ssh 调用的图片

答案1

我已经解决了该问题,将 /etc/netplan/01-network-all.yaml 文件修改为以下内容:

network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      addresses:
        - local ip/24
      gateway4: gateway ip
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4

之后我运行了以下命令:

sudo netplan --debug generate
sudo netplan apply
reboot

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