在使用 USB 网络共享 (NAT) 的情况下无法使用 sftp

2024-7-26 • tag-icon

概括：

我正在尝试从笔记本电脑连接到台式机来传输文件， sftp username@localIP但它给我连接超时

案件：

两台机器都使用 Linux 并连接到同一个路由器：
机器 1：台式机使用 USB 网络共享连接到互联网，手机连接到与第二台机器相同的路由器
机器 2：笔记本电脑使用无线连接到互联网

每个设备的 IP 使用hostname -I：
台式机：192.168.42.130
笔记本电脑：192.168.1.2

问题：

我可以从台式机连接到笔记本电脑，但反之则不行。我经常从台式机->笔记本电脑使用它，但每次我尝试从笔记本电脑->台式机连接时都会发生这种情况
（需要 2 分钟）：

ssh：连接到主机192.168.42.130端口 22：连接超时连接已关闭

1）尝试设置GSPAuthentication为否
2）尝试设置UseDNS为否
3）重新启动服务

但无济于事

注意：Len 是联想 (ielaptop) 的缩写
注意：路由器上只有两台 Linux 机器注意
：我没有电线，因此我在桌面上使用手机连接到互联网（使用 USB 网络共享）

1）从笔记本电脑连接到台式电脑：

omar@omar-Len:~/Desktop$ sftp [email protected] ssh: connect to host 192.168.1.8 port 22: Connection refused Connection closed

2）检查桌面地址（连接前）：

omar@omar-LDesktop:~$ ip -brief address
lo               UNKNOWN        127.0.0.1/8 ::1/128 
enp0s25          DOWN
enp0s29f7u2      UNKNOWN        192.168.42.130/24 fe80::69ce:4a20:5a7e:433c/64

3）在笔记本电脑上检查打开的连接（在连接两台机器之前）：

omar@omar-Len:~/Desktop$ netstat -tn | egrep -w 22
omar@omar-Len:~/Desktop$

（从 PC -> 笔记本电脑连接两台机器）

4）检查打开的连接：（
桌面）

omar@omar-LDesktop:~$ netstat -tn | egrep -w 22
tcp 0 0 192.168.42.130:44644 192.168.1.2:22 ESTABLISHED

（笔记本电脑）

omar@omar-Len:~/Desktop$ netstat -tn | egrep -w 22
tcp 0 0 192.168.1.2:22 192.168.1.8:44644 ESTABLISHED

（桌面）

omar@omar-LDesktop:~$ ps -ef | grep [s]shd
root 30538 1 0 19:07 ? 00:00:00 /usr/sbin/sshd -D

更新 2：（我想通过互联网连接两台机器以避免 NAT，所以这是我的试验）

我曾经sftp -vvv <publicIP>@<LocalIP>
从台式机->笔记本电脑进行连接，它要求我输入密码，当我输入密码时，它返回“权限被拒绝”，但如果我不使用<publicIP>

这是来自桌面的调试日志:(注意，我更改了我的<publicIP>）

sftp -vvv <publicIP>@omar-@[email protected]
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "192.168.1.2" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.1.2 [192.168.1.2] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/omar/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.1.2:22 as '<publicIP>@omar-@omar-Len'
debug3: hostkeys_foreach: reading file "/home/omar/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/omar/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 192.168.1.2
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: <hostKey>
SHA256:<SHA256>
debug3: hostkeys_foreach: reading file "/home/omar/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/omar/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 192.168.1.2
debug1: Host '192.168.1.2' is known and matches the ECDSA host key.
debug1: Found key in /home/omar/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/omar/.ssh/id_rsa ((nil))
debug2: key: /home/omar/.ssh/id_dsa ((nil))
debug2: key: /home/omar/.ssh/id_ecdsa ((nil))
debug2: key: /home/omar/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/omar/.ssh/id_rsa
debug3: no such identity: /home/omar/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/omar/.ssh/id_dsa
debug3: no such identity: /home/omar/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/omar/.ssh/id_ecdsa
debug3: no such identity: /home/omar/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/omar/.ssh/id_ed25519
debug3: no such identity: /home/omar/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
<publicIP>@omar-@[email protected]'s password: 
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
Permission denied, please try again.

这是从笔记本电脑进行的调试：

May  4 14:59:39 omar-Len sshd[10133]: Invalid user <publicIP>@omar-@omar-Len from 192.168.1.8 port 56890
May  4 14:59:44 omar-Len sshd[10133]: pam_unix(sshd:auth): check pass; user unknown
May  4 14:59:44 omar-Len sshd[10133]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.8
May  4 14:59:47 omar-Len sshd[10133]: Failed password for invalid user <publicIP>@omar-@omar-Len from 192.168.1.8 port 56890 ssh2
May  4 14:59:49 omar-Len sshd[10133]: Connection closed by invalid user <publicIP>@omar-@omar-Len 192.168.1.8 port 56890 [preauth]
May  4 15:03:50 omar-Len sudo:     omar : TTY=pts/0 ; PWD=/home/omar/Desktop ; USER=root ; COMMAND=/bin/nano //var/log/auth.log
May  4 15:03:50 omar-Len sudo: pam_unix(sudo:session): session opened for user root by (uid=0)
May  4 15:04:12 omar-Len sudo: pam_unix(sudo:session): session closed for user root

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