Hello everyone.
I have set up a proxmox server (version 6.8.12-7-pv) a while back, and I have been ignoring an issue that appeared since day one regarding the inability to ssh over the local network.
My network is behind a CGNAT, and in order to bypass it I setup a wireguard tunnel through a VPS that I am renting.
Initially, right after the installation, the ssh was working fine. For a while after setting the tunnel I could still ssh over LAN. But, after a reboot, I lost that ability. I have tried to find the issue, but I really don't understand what can it be.
I can ping the ip address, but i cannot telnet or ssh into it (the error i m getting is connection timeout)
The pve firewall is stopped, and I have no additional rules configured from the GUI. The ufw is not installed.
I looked at the packets on the vmbr0, (I don't have the logs for now, tcpdump -i vmbr0 port 22), and there is some inbound traffic being received, but the server never sends back anything.
I post now some relevant configurations:
Thank you in advance for your help!
I have set up a proxmox server (version 6.8.12-7-pv) a while back, and I have been ignoring an issue that appeared since day one regarding the inability to ssh over the local network.
My network is behind a CGNAT, and in order to bypass it I setup a wireguard tunnel through a VPS that I am renting.
Initially, right after the installation, the ssh was working fine. For a while after setting the tunnel I could still ssh over LAN. But, after a reboot, I lost that ability. I have tried to find the issue, but I really don't understand what can it be.
I can ping the ip address, but i cannot telnet or ssh into it (the error i m getting is connection timeout)
The pve firewall is stopped, and I have no additional rules configured from the GUI. The ufw is not installed.
I looked at the packets on the vmbr0, (I don't have the logs for now, tcpdump -i vmbr0 port 22), and there is some inbound traffic being received, but the server never sends back anything.
I post now some relevant configurations:
auto lo
iface lo inet loopback
iface eno1 inet manual
auto vmbr0
iface vmbr0 inet static
address 192.168.0.xx/24
gateway 192.168.0.1
bridge-ports eno1
bridge-stp off
bridge-fd 0
source /etc/network/interfaces.d/*
iface lo inet loopback
iface eno1 inet manual
auto vmbr0
iface vmbr0 inet static
address 192.168.0.xx/24
gateway 192.168.0.1
bridge-ports eno1
bridge-stp off
bridge-fd 0
source /etc/network/interfaces.d/*
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
netstat -tulpn | grep :22
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2111687/sshd: /usr/
tcp6 0 0 :::22 :::* LISTEN 2111687/
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2111687/sshd: /usr/
tcp6 0 0 :::22 :::* LISTEN 2111687/
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.0.1 0.0.0.0 UG 0 0 0 vmbr0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 vmbr0
default 192.168.0.1 0.0.0.0 UG 0 0 0 vmbr0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 vmbr0
nft list ruleset
table ip wg-quick-wg0 {
chain preraw {
type filter hook prerouting priority raw; policy accept;
iifname != "wg0" ip daddr 10.10.xx.x fib saddr type != local drop
}
chain premangle {
type filter hook prerouting priority mangle; policy accept;
meta l4proto udp meta mark set ct mark
}
chain postmangle {
type filter hook postrouting priority mangle; policy accept;
meta l4proto udp meta mark 0x0000ca6c ct mark set meta mark
}
}
table ip wg-quick-wg0 {
chain preraw {
type filter hook prerouting priority raw; policy accept;
iifname != "wg0" ip daddr 10.10.xx.x fib saddr type != local drop
}
chain premangle {
type filter hook prerouting priority mangle; policy accept;
meta l4proto udp meta mark set ct mark
}
chain postmangle {
type filter hook postrouting priority mangle; policy accept;
meta l4proto udp meta mark 0x0000ca6c ct mark set meta mark
}
}
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/local/bin:/usr/bin:/bin:/usr/games
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
Include /etc/ssh/sshd_config.d/*.conf
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
KbdInteractiveAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the KbdInteractiveAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via KbdInteractiveAuthentication may bypass
# the setting of "PermitRootLogin prohibit-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and KbdInteractiveAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
Subsystem sftp /usr/lib/openssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/local/bin:/usr/bin:/bin:/usr/games
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
Include /etc/ssh/sshd_config.d/*.conf
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
KbdInteractiveAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the KbdInteractiveAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via KbdInteractiveAuthentication may bypass
# the setting of "PermitRootLogin prohibit-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and KbdInteractiveAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
Subsystem sftp /usr/lib/openssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
Thank you in advance for your help!
Last edited:
