[SOLVED] New guests do not connect to internet

karlm

New Member
Jan 8, 2025
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I have a Proxmox 8.3.2 system with two working guests in containers - 1 is a Debian 12.7 and the other is a Ubuntu 24.10
They both accept inbound and outbound connections.


Every new guest I add will not allow me to connect to the internet.

I even cloned the Debian guest and that one would not connect.

My internet connection is:
Starlink (192,168.1.1) -> ROG Router in Repeater mode (192,168,1,36) - Proxmox (Wired 192,168,1,43)

My Proxmox host is running on an older Dell server with 13 2TB drives in a RAID 5 configuration, and 7 NICS, but no wireless. Hence the ROG.

The working guests can ping directly to the starlink, and to any internet host

The non working can ping other gests, but cannot ping 192.168.1.1

this is a non working guest:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.140/24
gateway 192.168.1.1

This is a working guest:
cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.139/24
gateway 192.168.1.1

Both are set to use host DNS which is:
192.168.1.1
192.168.1.36
8.8.8.8

I added a new bridge and assigned it to another physical nic, and get the same results.

I know I must be doing something wrong, but I have no idea what it is :)
 
Also, new vm's and containers get no valid IP address if I choose DHCP, but my existing ubuntu container uses DHCP.

These network issues affect both containers and windows VM's
 
I'm not sure if this is what you mean?
vmbr0:
ip -details l show master vmbr0
2: enp10s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP mode DEFAULT group default qlen 1000
link/ether 78:e3:b5:07:67:58 brd ff:ff:ff:ff:ff:ff promiscuity 1 allmulti 1 minmtu 68 maxmtu 9216
bridge_slave state forwarding priority 32 cost 5 hairpin off guard off root_block off fastleave off learning on flood on port_id 0x8001 port_no 0x1 designated_port 32769 designated_cost 0 designated_bridge 8000.78:e3:b5:7:67:58 designated_root 8000.78:e3:b5:7:67:58 hold_timer 0.00 message_age_timer 0.00 forward_delay_timer 0.00 topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off mcast_router 1 mcast_fast_leave off mcast_flood on bcast_flood on mcast_to_unicast off neigh_suppress off group_fwd_mask 0 group_fwd_mask_str 0x0 vlan_tunnel off isolated off locked off addrgenmode eui64 numtxqueues 8 numrxqueues 8 gso_max_size 65536 gso_max_segs 65535 tso_max_size 65536 tso_max_segs 65535 gro_max_size 65536 parentbus pci parentdev 0000:0a:00.0
16: fwpr3001p0@fwln3001i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP mode DEFAULT group default qlen 1000
link/ether 1e:e6:cf:aa:a2:bd brd ff:ff:ff:ff:ff:ff promiscuity 1 allmulti 1 minmtu 68 maxmtu 65535
veth
bridge_slave state forwarding priority 32 cost 2 hairpin off guard off root_block off fastleave off learning on flood on port_id 0x8002 port_no 0x2 designated_port 32770 designated_cost 0 designated_bridge 8000.78:e3:b5:7:67:58 designated_root 8000.78:e3:b5:7:67:58 hold_timer 0.00 message_age_timer 0.00 forward_delay_timer 0.00 topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off mcast_router 1 mcast_fast_leave off mcast_flood on bcast_flood on mcast_to_unicast off neigh_suppress off group_fwd_mask 0 group_fwd_mask_str 0x0 vlan_tunnel off isolated off locked off addrgenmode eui64 numtxqueues 24 numrxqueues 24 gso_max_size 65536 gso_max_segs 65535 tso_max_size 524280 tso_max_segs 65535 gro_max_size 65536

vmbr1:
ip -details l show master vmbr1
3: enp10s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr1 state UP mode DEFAULT group default qlen 1000
link/ether 78:e3:b5:07:67:59 brd ff:ff:ff:ff:ff:ff promiscuity 1 allmulti 1 minmtu 68 maxmtu 9216
bridge_slave state forwarding priority 32 cost 5 hairpin off guard off root_block off fastleave off learning on flood on port_id 0x8001 port_no 0x1 designated_port 32769 designated_cost 0 designated_bridge 8000.78:e3:b5:7:67:59 designated_root 8000.78:e3:b5:7:67:59 hold_timer 0.00 message_age_timer 0.00 forward_delay_timer 0.00 topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off mcast_router 1 mcast_fast_leave off mcast_flood on bcast_flood on mcast_to_unicast off neigh_suppress off group_fwd_mask 0 group_fwd_mask_str 0x0 vlan_tunnel off isolated off locked off addrgenmode eui64 numtxqueues 8 numrxqueues 8 gso_max_size 65536 gso_max_segs 65535 tso_max_size 65536 tso_max_segs 65535 gro_max_size 65536 parentbus pci parentdev 0000:0a:00.1
12: fwpr2001p0@fwln2001i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP mode DEFAULT group default qlen 1000
link/ether 52:53:eb:d9:ae:67 brd ff:ff:ff:ff:ff:ff promiscuity 1 allmulti 1 minmtu 68 maxmtu 65535
veth
bridge_slave state forwarding priority 32 cost 2 hairpin off guard off root_block off fastleave off learning on flood on port_id 0x8002 port_no 0x2 designated_port 32770 designated_cost 0 designated_bridge 8000.78:e3:b5:7:67:59 designated_root 8000.78:e3:b5:7:67:59 hold_timer 0.00 message_age_timer 0.00 forward_delay_timer 0.00 topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off mcast_router 1 mcast_fast_leave off mcast_flood on bcast_flood on mcast_to_unicast off neigh_suppress off group_fwd_mask 0 group_fwd_mask_str 0x0 vlan_tunnel off isolated off locked off addrgenmode eui64 numtxqueues 24 numrxqueues 24 gso_max_size 65536 gso_max_segs 65535 tso_max_size 524280 tso_max_segs 65535 gro_max_size 65536
20: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr1 state UP mode DEFAULT group default qlen 1000
link/ether 5e:a1:0c:ab:c8:57 brd ff:ff:ff:ff:ff:ff promiscuity 1 allmulti 1 minmtu 68 maxmtu 65535
veth
bridge_slave state forwarding priority 32 cost 2 hairpin off guard off root_block off fastleave off learning on flood on port_id 0x8003 port_no 0x3 designated_port 32771 designated_cost 0 designated_bridge 8000.78:e3:b5:7:67:59 designated_root 8000.78:e3:b5:7:67:59 hold_timer 0.00 message_age_timer 0.00 forward_delay_timer 0.00 topology_change_ack 0 config_pending 0 proxy_arp off proxy_arp_wifi off mcast_router 1 mcast_fast_leave off mcast_flood on bcast_flood on mcast_to_unicast off neigh_suppress off group_fwd_mask 0 group_fwd_mask_str 0x0 vlan_tunnel off isolated off locked off addrgenmode eui64 numtxqueues 24 numrxqueues 24 gso_max_size 65536 gso_max_segs 65535 tso_max_size 524280 tso_max_segs 65535 gro_max_size 65536
 
Well, I feel like an ID10T.
I rebooted the ROG router and now I have network to my new machines.
 
Ah right, well I guess the ROG is the weak link in the chain then :). Otherwise for the config, I was referring to the contents of the /etc/interfaces file.

Anyway glad it is sorted. Have fun.