
i had an ImageStream Linux-based router/firewall/VPN (with unlimited client licenses, all for under $6k) at my last gig, and it performed worlds better than the Cisco T3 router it was eventually replaced with (the Cisco was several times more expensive, and firewall and VPN were optional, and also expensive). my boss told me he wants the Linux box back (along with me, or someone at least as capable), but the new management at corporate HQ won't let him have it (or hire another BOFH-grade network type).
sorry if this offends the Cisco fanboys, but in my experience, Cisco devices are slow, expensive and poorly supported, and the support is hideously expensive too. if i had a question, i could call ImageStream and have a tech who knows the distro logged into my device within 15 minutes, checking things out. that's what i call support, and it only cost a couple-hundred dollars a year for 24/7/365 coverage. the ImageStream stayed up continuously for 4 years (i left around then). the Cisco failed after less than 12 months, and had to be repaired.
nothing personal, but most Cisco specialists don't know what they're missing. when people trot out those tired ASIC arguments, they neglect to mention that a recent networking speed record was set by a NetBSD box built on a generic PC platform.
finally, IOS (and all Cisco software, really) is still quite buggy and requires patching as much as Vista does. it may be a multi-billion-dollar global 800-pound networking gorilla, but Cisco has become bloated and complacent, and it's been that way for a long time. success has not been healthy for the company, regardless of profits. i'd rather have a responsive, agile vendor any day.
i haven't tried Vyatta's stuff, but maybe i should. if they're anything like ImageStream used to be, it could be a sweet product.