Guys, good afternoon I'm using in my bond interfaces as active backup, in theory, should assume an interface (or work) only when another interface is down. But I'm just lost packets on the interface that is not being used and is generating packet loss on bond. What can that be? Follow my settings bond [root at xxxxx ~]# ifconfig bond0 ; ifconfig eth0 ; ifconfig eth1 bond0 Link encap:Ethernet HWaddr 2C:59:E5:3C:71:68 inet addr:10.104.x.x Bcast:10.104.172.255 Mask:255.255.255.0 UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:38386574 errors:0 dropped:1295024 overruns:0 frame:0 TX packets:34733102 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:23626317629 (22.0 GiB) TX bytes:21028389425 (19.5 GiB) eth0 Link encap:Ethernet HWaddr 2C:59:E5:3C:71:68 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:37091397 errors:0 dropped:0 overruns:0 frame:0 TX packets:34732869 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:23524827730 (21.9 GiB) TX bytes:21028299937 (19.5 GiB) eth1 Link encap:Ethernet HWaddr 2C:59:E5:3C:71:68 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:1295179 errors:0 dropped:1294944 overruns:0 frame:0 TX packets:237 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:101490019 (96.7 MiB) TX bytes:90360 (88.2 KiB) [root at xxxxx ~]# [root at xxxxx ~]# cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) Bonding Mode: fault-tolerance (active-backup) Primary Slave: None Currently Active Slave: eth0 MII Status: up MII Polling Interval (ms): 1000 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth0 MII Status: up Speed: 10000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 2c:59:e5:3c:71:68 Slave queue ID: 0 Slave Interface: eth1 MII Status: up Speed: 10000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 2c:59:e5:3c:71:6c Slave queue ID: 0 [root at xxxxx ~]# cat /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 IPADDR=10.104.x.x NETMASK=255.255.255.0 ONBOOT=yes BOOTPROTO=none USERCTL=no BONDING_OPTS="mode=1 miimon=1000" In /var/log/messages I have a lot martian source .... [root at xxxxx ~]# tail -f /var/log/messages Sep 17 13:26:38 xxxxx kernel: IPv4: martian source 10.104.172.0 from 0.0.0.0, on dev bond0 Sep 17 13:26:38 xxxxx kernel: ll header: 00000000: ff ff ff ff ff ff 00 00 00 00 5b 00 08 00 ..........[... Sep 17 13:26:39 xxxxx kernel: IPv4: martian source 10.104.172.0 from 0.0.0.0, on dev bond0 Sep 17 13:26:39 xxxxx kernel: ll header: 00000000: ff ff ff ff ff ff 00 00 00 00 5b 01 08 00 ..........[... Sep 17 13:26:39 xxxxx kernel: IPv4: martian source 10.104.172.0 from 0.0.0.0, on dev bond0 Sep 17 13:26:39 xxxxx kernel: ll header: 00000000: ff ff ff ff ff ff 00 00 00 00 5b 00 08 00 ..........[... Sep 17 13:26:39 xxxxx kernel: IPv4: martian source 10.104.172.0 from 0.0.0.0, on dev bond0 Sep 17 13:26:39 xxxxx kernel: ll header: 00000000: ff ff ff ff ff ff 00 00 00 00 5b 00 08 00 ..........[... Sep 17 13:26:39 xxxxx kernel: IPv4: martian source 10.104.172.0 from 0.0.0.0, on dev bond0 Sep 17 13:26:39 xxxxx kernel: ll header: 00000000: ff ff ff ff ff ff 00 00 00 00 5b 01 08 00 ..........[... Sep 17 13:26:43 xxxxx kernel: net_ratelimit: 69 callbacks suppressed Thks ....