回复：路由器(192.168.1.x)后面接一个SPA2102网络电话适配器，适配器(192.168.7.x)接一台电脑上网。

Okay, your best option would be using your spa2102's routing part as your router. then, disable the routing part of your router and connect your pc. this way, all your network devices are on the same subnet. the way you were talking about create more problems since you have two dhcp providing two sets of local ip addresses.
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