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?
