How did you configured eth2? dhcp too? why you tap as bridge port intend of eth2?
2013/10/2 Ross Boylan <r...@biostat.ucsf.edu> > I setup bridging on my system for kvm, but on restart of the host system > (no guest VM's running) could not ping outside my local network. > > Bringing the bridge down corrected the problem, but I'm trying to > understand what is going on, and how I can make networking from the VM's > work. > > /etc/network/interfaces has (on the advice of a wiki page on Debian and > kvm) > auto br0 > iface br0 inet dhcp > pre-up ip tuntap add dev tap0 mode tap user root > pre-up ip link set tap0 up > bridge_ports all tap0 > bridge_stp off > bridge_maxwait 0 > bridge_fd 0 > post-down ip link set tap0 down > post-down ip tuntap del dev tap0 mode tap > > My one connected interface, eth2, was brought up by hotplug with no > mention in interfaces. > > Originally, with the system up, I added the br0 stanza to interfaces and > did ifup br0. This temporarily interrupted my network connections, > which was not good, but they resumed afterwords. > > This time I restarted the system and found networking non-functional. I > could not ping my ISP's nameserver. > # ip route > default via 192.168.40.10 dev eth2 proto static > 192.168.40.0/24 dev br0 proto kernel scope link src 192.168.40.103 > 192.168.40.0/24 dev eth2 proto kernel scope link src 192.168.40.102 > # ifconfig > Tue Oct 1 23:14:42 PDT 2013 > br0 Link encap:Ethernet HWaddr 60:a4:4c:21:bc:9f > inet addr:192.168.40.103 Bcast:192.168.40.255 > Mask:255.255.255.0 > inet6 addr: fe80::62a4:4cff:fe21:bc9f/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:896 errors:0 dropped:0 overruns:0 frame:0 > TX packets:434 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:100681 (98.3 KiB) TX bytes:49358 (48.2 KiB) > > eth1 Link encap:Ethernet HWaddr 60:a4:4c:21:bc:9f > UP BROADCAST MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) > Interrupt:17 Memory:f0600000-f0620000 > > eth2 Link encap:Ethernet HWaddr 60:a4:4c:21:bc:a0 > inet addr:192.168.40.102 Bcast:192.168.40.255 > Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:990 errors:0 dropped:0 overruns:0 frame:0 > TX packets:604 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:145073 (141.6 KiB) TX bytes:76668 (74.8 KiB) > Interrupt:18 Memory:f0500000-f0520000 > > lo Link encap:Local Loopback > inet addr:127.0.0.1 Mask:255.0.0.0 > inet6 addr: ::1/128 Scope:Host > UP LOOPBACK RUNNING MTU:16436 Metric:1 > RX packets:323 errors:0 dropped:0 overruns:0 frame:0 > TX packets:323 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0 > RX bytes:92559 (90.3 KiB) TX bytes:92559 (90.3 KiB) > > tap0 Link encap:Ethernet HWaddr ce:45:fc:e6:32:46 > UP BROADCAST MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:500 > RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) > > which looked OK to me; that is, ip route seems to show external packets > should go to eth2, which is the external interface, via the .10 address > of the router. But > # ping 198.144.192.2 > PING 198.144.192.2 (198.144.192.2) 56(84) bytes of data. > >From 192.168.40.102 icmp_seq=1 Destination Host Unreachable > > One difference between the ifconfig above and what I saw before > rebooting was that before rebooting eth2 had no IP (which seemed odd). > > ifdown br0 also brought eth2 down. I added iface eth2 inet dhcp > to /etc/network/interface and did ifup eth2; now I can reach the world > and see > # ip route > default via 192.168.40.10 dev eth2 proto static > 192.168.40.0/24 dev eth2 proto kernel scope link src 192.168.40.102 > > The operation of bridges and taps is mysterious to me, particularly the > relation between the two, even after reviewing man pages and various > other help. I'd appreciate any guidance. > > Thanks. > Ross Boylan > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact > listmas...@lists.debian.org > Archive: http://lists.debian.org/1380697545.7443.17.camel@localhost > > -- esta es mi vida e me la vivo hasta que dios quiera
