[Proxmox 7.1] Network problems (mostly no Ping, no GUI, no SSH)

[dragnod0]

Hi,
after i installed Proxmox on an new Machine the Network connection make problems. I use the same ip that I used with the old one.
Now i can't connect to the host.
If i ping the host from another machine, the first ping is ok but after that all pings lost. I can ping my router from the host with no issues.
I also cannot access the web GUI and connect via ssh.
But sometomes, all work perfect until i reboot.

 

[dcsapak]

can you post your network config and the output of

ip addr
ip link
ip route

also the network config from the client you try to access?

 

[dragnod0]

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: enp7s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 84:d8:1b:9d:31:d1 brd ff:ff:ff:ff:ff:ff
3: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 18:c0:4d:54:e1:6d brd ff:ff:ff:ff:ff:ff
4: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 18:c0:4d:54:e1:6d brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.10/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::1ac0:4dff:fe54:e16d/64 scope link
       valid_lft forever preferred_lft forever

ip link

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp7s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 84:d8:1b:9d:31:d1 brd ff:ff:ff:ff:ff:ff
3: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP mode DEFAULT group default qlen 1000
    link/ether 18:c0:4d:54:e1:6d brd ff:ff:ff:ff:ff:ff
4: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 18:c0:4d:54:e1:6d brd ff:ff:ff:ff:ff:ff

enp7s0 is a second network card only for an OPNsense VM

ip route

default via 192.168.1.1 dev vmbr0 proto kernel onlink
192.168.1.0/24 dev vmbr0 proto kernel scope link src 192.168.1.10

Client Config (Windows 10 Pro) but i don't realy think the Problem come from the Client.

Verbindungsgeschwindigkeit (Empfang/Übertragung):    1000/1000 (Mbps)
local IPv6-Adress:    fe80::5122:b272:xxxx:xxxx
IPv4-Adress:    192.168.1.205
IPv4-DNS-Server:    217.237.150.115, 217.237.151.205
Manufacturer:    Intel
Description:    Intel(R) I211 Gigabit Network Connection #2
Driverversion:    12.18.8.22
Physical address (MAC):    2C-xx-xx-xx-xx-xx

Either there is a problem with the Proxmox network / firewall configuration or my router (DrayTek Vigor 2760) is causing problems.