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Problem with connection 2900 series router and PIX

Our network had  3 old routers ( 2x2600 series and  1x1800 series) and one old PIX. So I decided to replace old routers with new 2900 series. everything works fine but internet is slow.after testing i saw that there is a trouble between PIX and 2900 series Router. timeout is so big about  300-400 ms and about after every 4-5 packets 1-2 time gets unreachable. What's a reason and how can I sole this problem?

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Hall of Fame Super Bronze

Problem with connection 2900 series router and PIX

Check for duplex/speed mismatch - make sure both are set to auto/auto.

Also, try replacing the cable.

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