Replacing modem with a vpn router

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http://serverfault.com – Can I replace an open network iconnect 624 modem with a cisco router in a small network that needs multiple PPTP VPN connection? iconnect 624 modem doesnt allow multple simultaneous PPTP VPN channels? So if i replace this modem with a cisco 881 router, will it work for ADSL 2+ internet and multiple simultaneous VPN connection? Please advice. Thank You. (HowTos)