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https://pve.proxmox.com/wiki/Network_Configuration


1- create a bridge

2- active the second interface



Solution
create Bridge

Need to install ifupdown2

ifdown enp2s0

ifdown vmbr1


iface vmbr1 inet dhcp

ifup enp2s0

ifup vmbr1

dhcp
root@hp8300:~# more /etc/network/interfaces
auto lo
iface lo inet loopback

iface eno1 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.0.9
        netmask 255.255.255.0
        gateway 192.168.0.1
        bridge_ports eno1
        bridge_stp off
        bridge_fd 0

iface enp2s0 inet manual

auto vmbr1
iface vmbr1 inet dhcp
        bridge_ports enp2s0
        brdige_stp off

dhcp client
root@hp8300:~# ifup vmbr1

Waiting for vmbr1 to get ready (MAXWAIT is 32 seconds).
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/vmbr1/68:05:ca:16:08:6f
Sending on   LPF/vmbr1/68:05:ca:16:08:6f
Sending on   Socket/fallback
Created duid "\000\001\000\001'IG\375h\005\312\026\010o".
DHCPDISCOVER on vmbr1 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on vmbr1 to 255.255.255.255 port 67 interval 8
DHCPOFFER of 192.168.1.12 from 192.168.1.1
DHCPREQUEST for 192.168.1.12 on vmbr1 to 255.255.255.255 port 67
DHCPACK of 192.168.1.12 from 192.168.1.1
bound to 192.168.1.12 -- renewal in 33322 seconds.
root@hp8300:~#
ip addr and ping 
root@hp8300:~# 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: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr0 state UP group default qlen 1000
    link/ether 6c:3b:e5:38:93:35 brd ff:ff:ff:ff:ff:ff
3: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master vmbr1 state UP group default qlen 1000
    link/ether 68:05:ca:16:08:6f 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 6c:3b:e5:38:93:35 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.9/24 brd 192.168.0.255 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::6e3b:e5ff:fe38:9335/64 scope link
       valid_lft forever preferred_lft forever
5: vmbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 68:05:ca:16:08:6f brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.12/24 brd 192.168.1.255 scope global dynamic vmbr1
       valid_lft 86248sec preferred_lft 86248sec
    inet6 fe80::6a05:caff:fe16:86f/64 scope link
       valid_lft forever preferred_lft forever


root@hp8300:~# ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=2.71 ms



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