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Of these two, the Jetdirect 635n (also known as J7961G) allegedly has IPv6 support, and is therefore a suitable candidate to upgrade our Laserjet 4250. This is not a reasonably new printer, but the embedded J7949E doesn't do IPv6. Funnily enough the configuration pages web interface of the J7949E explicitly list IPv4, lists IPv4 on the appropriate configuration pages - probably HP wanted to make very clear that it is IPv4, and not IPv6.
After receiving the unit box I was happy to see the IPv6 ready Gold logo on the box 
. The card itself is not very spectacular, the only notable things are a SafeXcel 1141 crypto coprocessor, and a Broadcom BCM5788 Gbic.
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