Hi, How can you ensure that only IP traverses across your ISDN line when it is up. Scenario is that we have to run the ISDN line most efficient as possible so that no matter what is configured on the router only IP can go across it. I have tried a normal access list but of course for instance IPX would still run across the line. I have thought about a protocol filter and filter on 0x0800 but of course the ISDN line has pp encapsulation on it and this protocol filter would only work if ti was an 802.3 frame which unfortunately its not.
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