Re: [Qemu-discuss] How to convert from ifconfig to ip ?

[Pierre Couderc]

Thank you very much, Pascal.

When I compare what is working for you :

4: tap0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel 
state DOWN group default qlen 1000
    link/ether 7e:89:46:3d:b0:d4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.1/24 <http://192.168.1.1/24> scope global tap0
       valid_lft forever preferred_lft forever


  what is workin for me (XP VM):

4: tap0: <NO-CARRIER,BROADCAST,MULTICAST,DYNAMIC,UP> mtu 1500 qdisc 
pfifo_fast state DOWN group default qlen 1000
    link/ether 7e:2f:8b:e5:a3:1e brd ff:ff:ff:ff:ff:ff
    inet 192.168.164.1/24 brd 192.168.164.255 scope global tap0
       valid_lft forever preferred_lft forever

andd what is *NOT* working for me :

3: tap0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast 
state DOWN group default qlen 1000
    link/ether 3a:07:06:79:0a:c5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.164.1/32 scope global tap0
       valid_lft forever preferred_lft forever
    inet6 fec0::3807:6ff:fe79:ac5/64 scope site deprecated mngtmpaddr 
dynamic
       valid_lft 36345sec preferred_lft 0sec
    inet6 fe80::3807:6ff:fe79:ac5/64 scope link
       valid_lft forever preferred_lft forever

the difference seems to be the presence of IPV6 in 'bad' case...


On 07/27/2018 09:02 AM, Pascal wrote:
> hello, this is working for me :
>
> # ip link show tap0
> Device "tap0" does not exist.
>
> # ip tuntap add mode tap dev tap0 group kvm
>
> # ip link show tap0
> 4: tap0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode 
> DEFAULT group default qlen 1000
>     link/ether 7e:89:46:3d:b0:d4 brd ff:ff:ff:ff:ff:ff
>
> # ip link set dev tap0 up
>
> # ip link show tap0
> 4: tap0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel 
> state DOWN mode DEFAULT group default qlen 1000
>     link/ether 7e:89:46:3d:b0:d4 brd ff:ff:ff:ff:ff:ff
>
> # ip addr add 192.168.1.1/24 <http://192.168.1.1/24> dev tap0
>
> # ip addr show tap0
> 4: tap0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel 
> state DOWN group default qlen 1000
>     link/ether 7e:89:46:3d:b0:d4 brd ff:ff:ff:ff:ff:ff
>     inet 192.168.1.1/24 <http://192.168.1.1/24> scope global tap0
>        valid_lft forever preferred_lft forever
>
> # ping -c 4 192.168.1.1
> PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
> 64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=1 ttl=64 
> time=0.021 ms
> 64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=2 ttl=64 
> time=0.015 ms
> 64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=3 ttl=64 
> time=0.019 ms
> 64 bytes from 192.168.1.1 <http://192.168.1.1>: icmp_seq=4 ttl=64 
> time=0.015 ms
>
> --- 192.168.1.1 ping statistics ---
> 4 packets transmitted, 4 received, 0% packet loss, time 3107ms
> rtt min/avg/max/mdev = 0.015/0.017/0.021/0.005 ms
>
> regards.
>
> 2018-07-26 19:19 GMT+02:00 Pierre Couderc <address@hidden 
> <mailto:address@hidden>>:
>
>     My bridge for qemu is started with :
>
>     sysctl net.ipv4.ip_forward=1
>     tunctl -t tap0 -u nous
>     ifconfig tap0 192.168.164.1 up
>     iptables...
>
>     I have replaced ipconfig line with ip:
>
>     ip link set tap0 up
>     ip address add 192.168.164.1 dev tap0
>
>     but it fails (no ping 192.168.164.1) in the vm.
>
>     What do I miss ?
>
>     Thanks
>     PC