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

[Greg Kurz]

On Fri, 27 Jul 2018 09:23:36 +0200
Pierre Couderc <address@hidden> wrote:

> 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...
> 

And the /24 mask... maybe try to do the same as Pascal:

ip address add 192.168.164.1/24 dev tap0

> 
> 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
> >
> >
> >
> >  
>