hexianguo：本案例在ROO上指了一条到172.16.20.75/32的路由从E1出去，它比172.16.20.0/24的直连路由更具体。

wly0591：谁规定的不同vlan一定要不同网段的地址？那如果是同一网段间主机要隔离通信怎么做？明显只能用vlan技术把他们隔离好吗

gaofengsars：真是好贴啊，现在正在学习思科安全，真是太好了

w1a2a3w：顶了顶了顶了顶了

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