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Voyager

Member

Registered: 2014-06-10

Posts: 26

Problem with bridge interface - can't connect to host from VM

Hi guys.

I'm trying to set up bridge interface for my virtual machines. It seems that it works. All VMs are able to connect to each other and they do have access to the Internet. The problem that they can't reach the host where the bridge interface is running.
Could you please point me how to fix this?

Thank you.

branch

Member

Registered: 2014-03-16

Posts: 209

Re: Problem with bridge interface - can't connect to host from VM

We will need more info. What utility is configuring the network on the host? Configuration files? What is creating/configuring the bridge? Configuration files for this? Output of these commands may help (on host, some need sudo):
ip link
ip addr
brctl show
iptables-save

I'm sure i am missing something but this would be a start.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,354

Re: Problem with bridge interface - can't connect to host from VM

You might also tell us if you are using VMware, VirtualBox, Qemu ??

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Voyager

Member

Registered: 2014-06-10

Posts: 26

Re: Problem with bridge interface - can't connect to host from VM

I'm trying to use qemu and libvirt.
Ethernet and bridge was configured with systemd-networkd service. I don't have any firewalls installed/configured

Interface configuration files:
eno1 (my Ethernet card)

[Match]
Name=eno1

[Network]
Bridge=br0

br0.netdev

[NetDev]
Name=br0

br0.network

[Match]
Name=br0

[Network]
#DNS=127.0.0.1
Address=192.168.88.254/24
Gateway=192.168.88.1

ip link; ip addr; brctl show

ip link                                                                                                             
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default                                         
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00                                                                              
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 4000 qdisc pfifo_fast master br0 state UP mode DEFAULT group default qlen 1000          
    link/ether c8:60:00:8c:ba:f5 brd ff:ff:ff:ff:ff:ff                                                                                 
3: enp12s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000                                  
    link/ether c8:60:00:8c:b7:ae brd ff:ff:ff:ff:ff:ff                                                                                 
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 4000 qdisc noqueue state UP mode DEFAULT group default                                   
    link/ether c8:60:00:8c:ba:f5 brd ff:ff:ff:ff:ff:ff
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default 
    link/ether 9e:e7:59:ce:a0:02 brd ff:ff:ff:ff:ff:ff

ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default                                                      
    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 4000 qdisc pfifo_fast master br0 state UP group default qlen 1000
    link/ether c8:60:00:8c:ba:f5 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::ca60:ff:fe8c:baf5/64 scope link 
       valid_lft forever preferred_lft forever
3: enp12s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 4000 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether c8:60:00:8c:b7:ae brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 4000 qdisc noqueue state UP group default 
    link/ether c8:60:00:8c:ba:f5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.88.254/24 brd 192.168.88.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::42c:f3ff:fe97:46f2/64 scope link 
       valid_lft forever preferred_lft forever
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 9e:e7:59:ce:a0:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
6: macvtap0@br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 4000 qdisc pfifo_fast state UNKNOWN group default qlen 500
    link/ether 52:54:00:85:2f:db brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:fe85:2fdb/64 scope link 
       valid_lft forever preferred_lft forever

brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.c860008cbaf5       no              eno1
virbr0          8000.000000000000       yes

arp on the host (192.168.88.245 - IP of my VM, was assigned by DHCP on the router)

Address                  HWtype  HWaddress           Flags Mask            Iface
router                   ether   d4:ca:6d:73:79:51   C                     br0
192.168.88.245                   (incomplete)                              br0