这是我的网络配置：
bond interface 192.168.101.50/24 has two salaves: eth1 (192.168.101.1) that is connected to 192.168.101.2 and eth2 (192.168.101.10) that is connected to 192.168.101.11.
我在active-backup中创建了一个bond接口bond0：
bond0 Link encap:Ethernet HWaddr 00:E0:4C:48:09:36
inet addr:192.168.101.50 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::2e0:4cff:fe48:936/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:70 errors:0 dropped:0 overruns:0 frame:0
TX packets:205 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4968 (4.8 KiB) TX bytes:14126 (13.7 KiB)
然后我有两个以太网接口
eth1 Link encap:Ethernet HWaddr 00:E0:4C:48:09:36
inet addr:192.168.101.1 Bcast:192.168.101.255 Mask:255.255.255.0
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:84 errors:0 dropped:0 overruns:0 frame:0
TX packets:218 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5764 (5.6 KiB) TX bytes:17132 (16.7 KiB)
eth2 Link encap:Ethernet HWaddr 00:E0:4C:48:09:36
inet addr:192.168.101.10 Bcast:192.168.101.255 Mask:255.255.255.0
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:41 errors:0 dropped:0 overruns:0 frame:0
TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2760 (2.6 KiB) TX bytes:6412 (6.2 KiB)
然后我定义了一个多队列调度，定义了两个队列：eth1 的队列 1 和 eth2 的队列 2。规则如下：
tc filter add dev bond0 protocol ip parent 1: prio 1 u32 match ip \
dst 192.168.101.2 action skbedit queue_mapping 1
tc filter add dev bond0 protocol ip parent 1: prio 1 u32 match ip \
dst 192.168.101.11 action skbedit queue_mapping 2
这是实际的配置：
9: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc fq_codel master bond0 state UP mode DEFAULT group default qlen 1000
link/ether 00:e0:4c:48:09:36 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 9194
bond_slave state ACTIVE mii_status UP link_failure_count 0 perm_hwaddr 00:e0:4c:48:08:10 queue_id 1 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 16354 gso_max_segs 65535
RX: bytes packets errors dropped missed mcast
5764 84 0 0 0 0
RX errors: length crc frame fifo overrun
0 0 0 0 0
TX: bytes packets errors dropped carrier collsns
17132 218 0 0 0 0
TX errors: aborted fifo window heartbeat transns
0 0 0 0 16
14: eth2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc fq_codel master bond0 state UP mode DEFAULT group default qlen 1000
link/ether 00:e0:4c:48:09:36 brd ff:ff:ff:ff:ff:ff promiscuity 1 minmtu 68 maxmtu 9194
bond_slave state BACKUP mii_status UP link_failure_count 0 perm_hwaddr 00:e0:4c:48:09:36 queue_id 2 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 16354 gso_max_segs 65535
RX: bytes packets errors dropped missed mcast
2760 41 0 0 0 0
RX errors: length crc frame fifo overrun nohandler
0 0 0 0 0 5
TX: bytes packets errors dropped carrier collsns
6412 88 0 0 0 0
TX errors: aborted fifo window heartbeat transns
0 0 0 0 4
我以为定义多队列模式后，我能够 ping 到连接到 BACKUP 接口的设备 192.168.101.11（通过 eth2）。但是没有办法 ping 它。有没有办法 ping 到连接到 BACKUP 接口的设备？我无法设置状态 ACTIVE，我需要在 eth2 处于备份状态时 ping。非常感谢。
答案1
一种相对简单的方法是添加静态路由。
例如：WAN 1 网关 IP 为：1.2.3.4 WAN 1 网关 IP 为：4.3.2.1
/ip 路由添加距离=1 目标地址=8.8.8.8 网关=1.2.3.4 添加距离=1 目标地址=8.8.4.4 网关=4.3.2.1
现在您可以放心，对 Google 主 DNS 8.8.8.8 的 ping 操作将从 WAN1 出站，而对 Google 辅助 DNS 8.8.4.4 的 ping 操作将从 WAN2 出站，如果其中一个发生故障，则对该 DNS 的 ping 操作将会失败。
有更优雅的解决方案，但这是一种快捷的方法。