Any suggestions for a CISCO or LINKSYS DSL router to replace a Zyxel (Century Link) PK5001Z? System is Windows XP Pro, 20 wireless and wired devices connected (including 6 CISCO WVC210 IP cameras ). The Zyxel forwards as many ports as I want, but will only open a limited number of the ports. This limits my access thru the internet (local network sees all cameras). Zyxel support is unable to help.