升级到 ubuntu 15.10 后，我无法通过 pptp 与我的服务器建立 ssh 连接，但我可以从我的服务器 ssh 到升级后的 PC。在本地网络中，ssh 工作正常。此外，我的 nfs 安装一段时间后会挂起，这些安装也是通过 pptp 安装的。我可以使用 samba、ftp 连接到我的服务器，我可以 ping 到服务器。这是我尝试通过 pptp 进行 ssh 时的输出：
debug1: Reading configuration data /etc/ssh/ssh_configdebug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 192.168.88.100 [192.168.88.100] port 22.
debug1: Connection established.
debug1: identity file /home/rpr/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/rpr/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9p1 Ubuntu-2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.2_hpn13v11 FreeBSD-20130515
debug1: match: OpenSSH_6.2_hpn13v11 FreeBSD-20130515 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 192.168.88.100:22 as 'rpr'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr [email protected] none
debug1: kex: client->server aes128-ctr [email protected] none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
答案1
尝试将 mtu 降低到 1392 左右。您可以输入以下命令进行测试：
ifconfig ppp0 mtu 1392
或低于 1492 的其他值，一旦找到可行的值，即可使其永久生效，编辑 /etc/ppp/peers/ 并添加
mtu <value>
例如 mtu 1492