Fl_wolf 发表于 2021-04-09 09:06

同一网段双网关问题

本帖最后由 Fl_wolf 于 2021-04-09 09:07 编辑

背景:
我司在测试SDWAN,
在10.30.1.X 网段中,网络做了SDN。
原始网关为 10.30.1.1本机IP为 10.30.1.37/24


SDWAN设备接入内网IP为 10.30.1.200/24    默认吓一跳指向网关10.30.1.1
需要访问分公司机构IP172.16.1.100/24


现设置:
本机地址:10.30.1.37/24    GW:10.30.1.200
本机路由: 172.16.1.X /24 10.30.1.200
SDN路由: 172.16.1.X /24 10.30.1.200


但是 本机内 tracert 的结果   第一跳依然是10.30.1.1(SDN网关) 导致在内网寻找 172.16.1.X 的地址。
不仅是ICMP包。包括H.323协议也是这样。




最后解决办法是 修改SDWAN设备到其他网段并修改路由即可。




提问:
初步觉得是说是ICMP重定向问题。。
路由有没有类似这类型的重定向机制呢?
有没有大神普及下这个到底是什么问题呢?undefined

猎食者 发表于 2021-05-25 13:29

应该是ARP查询1、10.30.1.37/24与10.30.1.200 /24是同段地址,这两者之间查MAC地址表与arp表就可以正常通讯。
    假如10.30.1.37与10.30.1.200没有通讯记录,1.37与1.200发起数据交换,会发广播报文查询,之后会在本地形成MAC表与ARP表,属于二层通讯问题。
2、10.30.1.37想通过1.200去访问172.16.1.x,这是跨网段通讯,数据包肯定会交给网关去处理,这是属于三层通讯问题了。到这就需要再去查询第三张表,路由表。


10.30.1.37的网关虽然设置成了10.30.1.200,1.200的网关设置成了10.30.1.1.。本质上还是同网段通讯,跨网段访问还是需要经过10.30.1.1网关的。

我认为应该重点理解一下ARP协议。

可能说的不太清楚,仅供参考

Fl_wolf 发表于 2021-05-26 14:47

回复 2# 猎食者
这个能理解。但是我不明白的是。

10.30.1.37/24 GW:10.30.1.200
的路由 为什么不是先经过 1.200 而是 直接到网关的1.1


猎食者 发表于 2021-05-27 10:44

回复 3# Fl_wolf

同vlan内的设备通讯是不会通过网关的,它的通讯发生在数据链路层,也就是二层,第一次建立联系的时候用广播,后续用单播。
表面上看是两个IP地址之间的通讯,本质还是二层通讯。

计算机的MAC地址表建立是通过ARP协议来实现的。
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**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
通过ARP协议完成IP地址与MAC地址对应关系。
交换机里的MAC地址表是完成计算机与交换机端口的对应关系。
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**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

10.30.1.37想去172.16.1.x这个网段,肯定要先去网关,那就会先查本机的IP与MAC对应表。
因为10.30.1.37网关你写的是10.30.1.200,所以会先找1.200,发广播,问1.200的设备怎么去。
1.37发的广播包进入交换机,问询1.200MAC地址。这时交换机会查MAC地址表,记住是交换机的MAC地址表。图二所示。从交换机里查到从1/0/XX端口学到的1.200的地址
别的设备收到广播,查看不是找自己的就会丢弃。只有10.30.1.200会回应,以单播包回应,因为广播包是带着源地址的,所以,1.200回应的时候就会把这个10.30.1.37的源地址当做它要发送的目的地址,
1.37收到1.200的单播报文,知道了怎么去1.200。
这是第一阶段
光知道怎么去1.200是不行的,最终目的是要去172.16.1.X
所以这时候,发单播报文,向1.200查询172.17.1.x网段。1.200一看自己的arp表,没有,所以数据包会丢弃。



所以,是不能与172.16.1.x通讯的。

那为什么能到网关通呢?
那是因为,它们是同段地址或者说同一VLAN。10.30.1.37与10.30.1.1通讯是不会通过1.200的。会直接查MAC地址表,
假如想让1.37通过1.200去访问172.16.1.x网段。需要在1.200上路由。
剩下的没有深究。
你可以验证一下。

猎食者 发表于 2021-05-27 17:13

回复 3# Fl_wolf

跨网段,数据包会直接丢给1.200,但是1.200没有到172.16.1.x的路由,所以会不通
到10.30.1.1可以PING通,因为10.30.1.37跟10.30.1.1是同网段地址,掩码都是24位,数据根本不会去找1.200去,也就是说同网内通讯数据不会经过网关的。
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查看完整版本: 同一网段双网关问题