Hello, we use KVM virtualization (Proxmox VE 3) and we have two VMs. 101 - webserver (apache, mod_php) 102 - database server (mariadb) 101 has 3 network interfaces. 2 are bridged to "net"(vmbr0), one to "lan"(vmbr1) 102 has 1 network interface bridged to "lan" Sometimes for less that 1 minute, 101 lost connection to 102. PHP cant connect to mysql. I try to ping servers. when I ping from 101 to 102 its 100% packet loss. But when I ping from 102 to 101 its 0% packet loss. After minute(s) its working again normaly. Also restarting apache help, but not everytime. I dont know how to solve this. 101 Code: root@web:/home/feldsam# ifconfig eth0 Link encap:Ethernet HWaddr d2:ff:3a:4b:4e:3f inet addr:93.185.103.242 Bcast:93.185.103.255 Mask:255.255.255.0 inet6 addr: fe80::d0ff:3aff:fe4b:4e3f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:10760037 errors:0 dropped:0 overruns:0 frame:0 TX packets:27580 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2389942182 (2.2 GiB) TX bytes:57512694 (54.8 MiB) eth2 Link encap:Ethernet HWaddr de:3c:57:d0:53:9c inet addr:93.185.103.243 Bcast:93.185.103.255 Mask:255.255.255.0 inet6 addr: fe80::dc3c:57ff:fed0:539c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3624689 errors:0 dropped:0 overruns:0 frame:0 TX packets:6030104 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1369793737 (1.2 GiB) TX bytes:14787478397 (13.7 GiB) eth3 Link encap:Ethernet HWaddr 32:7e:97:96:ee:bb inet addr:10.0.1.1 Bcast:10.0.255.255 Mask:255.255.0.0 inet6 addr: fe80::307e:97ff:fe96:eebb/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:239980906 errors:0 dropped:0 overruns:0 frame:0 TX packets:233151498 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:316744952602 (294.9 GiB) TX bytes:34912096999 (32.5 GiB) 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:4922679 errors:0 dropped:0 overruns:0 frame:0 TX packets:4922679 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:7186122674 (6.6 GiB) TX bytes:7186122674 (6.6 GiB) 102 Code: root@mysql0:~# ifconfig eth0 Link encap:Ethernet HWaddr 0a:6f:e9:f2:65:47 inet addr:10.0.1.2 Bcast:10.0.255.255 Mask:255.255.0.0 inet6 addr: fe80::86f:e9ff:fef2:6547/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:233528239 errors:0 dropped:0 overruns:0 frame:0 TX packets:240361563 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:34967626032 (32.5 GiB) TX bytes:317241696150 (295.4 GiB) 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:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) host node Code: root@node0:~# ifconfig eth0 Link encap:Ethernet HWaddr 00:26:2d:03:15:4c inet6 addr: fe80::226:2dff:fe03:154c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14727470 errors:0 dropped:0 overruns:0 frame:0 TX packets:51874174 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3281272744 (3.0 GiB) TX bytes:74233241996 (69.1 GiB) 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:99528 errors:0 dropped:0 overruns:0 frame:0 TX packets:99528 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:79532612 (75.8 MiB) TX bytes:79532612 (75.8 MiB) tap101i0 Link encap:Ethernet HWaddr 9e:53:bc:b1:d5:22 inet6 addr: fe80::9c53:bcff:feb1:d522/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:27586 errors:0 dropped:0 overruns:0 frame:0 TX packets:10848476 errors:0 dropped:0 overruns:71101 carrier:0 collisions:0 txqueuelen:500 RX bytes:57513106 (54.8 MiB) TX bytes:2408587508 (2.2 GiB) tap101i1 Link encap:Ethernet HWaddr 9e:ad:7f:78:ff:e8 inet6 addr: fe80::9cad:7fff:fe78:ffe8/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:256 errors:0 dropped:0 overruns:1 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:16328 (15.9 KiB) tap101i2 Link encap:Ethernet HWaddr 2e:ee:86:d3:eb:88 inet6 addr: fe80::2cee:86ff:fed3:eb88/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:6093888 errors:0 dropped:0 overruns:0 frame:0 TX packets:3634583 errors:0 dropped:0 overruns:2374 carrier:0 collisions:0 txqueuelen:500 RX bytes:14942513137 (13.9 GiB) TX bytes:1371836380 (1.2 GiB) tap101i3 Link encap:Ethernet HWaddr c6:73:db:06:6e:1b inet6 addr: fe80::c473:dbff:fe06:6e1b/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:234467363 errors:0 dropped:0 overruns:0 frame:0 TX packets:241340823 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:35103230049 (32.6 GiB) TX bytes:318659148473 (296.7 GiB) tap102i0 Link encap:Ethernet HWaddr 72:93:d6:91:b9:6f inet6 addr: fe80::7093:d6ff:fe91:b96f/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:241371961 errors:0 dropped:0 overruns:0 frame:0 TX packets:234505545 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:318670616073 (296.7 GiB) TX bytes:35105886938 (32.6 GiB) tap103i0 Link encap:Ethernet HWaddr a6:d7:c3:0c:c1:ef inet6 addr: fe80::a4d7:c3ff:fe0c:c1ef/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:19808 errors:0 dropped:0 overruns:0 frame:0 TX packets:25965 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:7021510 (6.6 MiB) TX bytes:1855486 (1.7 MiB) tap104i0 Link encap:Ethernet HWaddr 02:39:70:9e:13:ef inet6 addr: fe80::39:70ff:fe9e:13ef/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:6763 errors:0 dropped:0 overruns:0 frame:0 TX packets:8169 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:500953 (489.2 KiB) TX bytes:913387 (891.9 KiB) venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet6 addr: fe80::1/128 Scope:Link UP BROADCAST POINTOPOINT RUNNING NOARP 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:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) veth100.0 Link encap:Ethernet HWaddr 9e:32:eb:11:b4:3c inet6 addr: fe80::9c32:ebff:fe11:b43c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:17413 errors:0 dropped:0 overruns:0 frame:0 TX packets:26205 errors:0 dropped:4 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:3306150 (3.1 MiB) TX bytes:1763990 (1.6 MiB) veth108.0 Link encap:Ethernet HWaddr aa:37:3d:5f:ec:fb inet6 addr: fe80::a837:3dff:fe5f:ecfb/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:69358 errors:0 dropped:0 overruns:0 frame:0 TX packets:861764 errors:0 dropped:1999012 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:9893335 (9.4 MiB) TX bytes:68907763 (65.7 MiB) vmbr0 Link encap:Ethernet HWaddr 00:26:2d:03:15:4c inet addr:93.185.103.99 Bcast:93.185.103.255 Mask:255.255.255.0 inet6 addr: fe80::226:2dff:fe03:154c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3097045 errors:0 dropped:0 overruns:0 frame:0 TX packets:2126900 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:173136112 (165.1 MiB) TX bytes:56399550513 (52.5 GiB) vmbr1 Link encap:Ethernet HWaddr 9e:32:eb:11:b4:3c inet addr:10.0.254.254 Bcast:10.0.255.255 Mask:255.255.0.0 inet6 addr: fe80::2015:79ff:fee8:3f71/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:64925 errors:0 dropped:0 overruns:0 frame:0 TX packets:84355 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:20854793 (19.8 MiB) TX bytes:6529228 (6.2 MiB) EDIT: Hi, I solved it yet. I have another VM on same bridge with the same IP as has webserver So my big fail.
