为具有多个接口的设备设置 MTU
我正在使用
ioctl(s, SIOCSIFMTU, (caddr_t)&ifr)
更改接口的 MTU。
代码与此类似
struct ifreq ifr;
ifr.ifr_addr.sa_family = AF_INET;
//iap->ifa_name is bond1:xx
strncpy(ifr.ifr_name, iap->ifa_name, sizeof(ifr.ifr_name));
ifr.ifr_mtu = 1492;
ioctl(s, SIOCSIFMTU, (caddr_t)&ifr)
我的问题是设备有多个接口并且MTU设置为1492 对于所有这些。我只想专门针对一个界面执行此操作,而不影响所有其他界面。我该怎么做呢?
bond1:43 链接 encap:以太网 HWaddr 00:0E:0C:E4:C5:45
inet 地址:10.7.181.59 广播:10.7.181.255 掩码:255.255.255.0 上行广播运行主组播 MTU:1492 指标:1
bond1:48 链接 encap:以太网 HWaddr 00:0E:0C:E4:C5:45
inet 地址:10.7.181.60 广播:10.7.181.255 掩码:255.255.255.0 上行广播运行主组播 MTU:1492 指标:1
bond1:49 链接 encap:以太网 HWaddr 00:0E:0C:E4:C5:45
inet 地址:10.7.181.61 广播:10.7.181.255 掩码:255.255.255.0 上行广播运行主组播 MTU:1492 指标:1
I am using
ioctl(s, SIOCSIFMTU, (caddr_t)&ifr)
to change the MTU for an interface.
code is similar to this
struct ifreq ifr;
ifr.ifr_addr.sa_family = AF_INET;
//iap->ifa_name is bond1:xx
strncpy(ifr.ifr_name, iap->ifa_name, sizeof(ifr.ifr_name));
ifr.ifr_mtu = 1492;
ioctl(s, SIOCSIFMTU, (caddr_t)&ifr)
My problem is that the device has multiple interfaces and that the MTU is set to 1492
for all of these. I want to do it specifically for only one interface, leaving all the others not impacted. How can I do it?
bond1:43 Link encap:Ethernet HWaddr 00:0E:0C:E4:C5:45
inet addr:10.7.181.59 Bcast:10.7.181.255 Mask:255.255.255.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1492 Metric:1
bond1:48 Link encap:Ethernet HWaddr 00:0E:0C:E4:C5:45
inet addr:10.7.181.60 Bcast:10.7.181.255 Mask:255.255.255.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1492 Metric:1
bond1:49 Link encap:Ethernet HWaddr 00:0E:0C:E4:C5:45
inet addr:10.7.181.61 Bcast:10.7.181.255 Mask:255.255.255.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1492 Metric:1
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如果您想更新特定接口的 MTU,您应将
struct ifreq
的ifr_name
字段设置为接口的名称编辑:您的问题是以接口的名称。接口名称中列后面的数字只是一个别名。实际上,您没有多个不同的接口,而是相同的接口。这就是为什么您的设置会应用于名称为“bond:xx”的所有接口。
If you want to update MTU for the specific interface you shallset
ifr_name
field of thestruct ifreq
to the name of the interfaceEDIT: You problem is in the name of the interface. The number after the column in the interface name is just an alias. Actually, you don't have several different interfaces it's the same interface. That is why you setting is applied onto all interfaces with name "bond:xx"
这可能有效。首先获取 Alias 接口并设置 MTU 。
This may work . Get the Alias interface first and the set the MTU .