Reassigning IPv6 temporary address when it receives router advertisements

Hi everybody.
I've just met a problem with IPv6 connectivity.
*My environment*
I list my environment that I tested as follows.
1. MacBook Pro (A)
OS Version: 10.6.4
Card Type: AirPort Extreme (0x14E4, 0x93)
Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.16.1)
IPv6 temporary address setting: net.inet6.ip6.use_tempaddr=1
2. AP+Router
TimeCapsule
N.B., I experienced same problem under other sets of router and access point (Cisco's ones). So, let me skip to write the detail of this.
3. MacBook Pro (B) (No problem with this Laptop)
OS Version: 10.6.4
Card Type: AirPort Extreme (0x168C, 0x87)
Firmware Version: Atheros 5416: 2.0.19.10
IPv6 temporary address setting: net.inet6.ip6.use_tempaddr=1
N.B., All user data and settings are transferred to MacBook Pro (A). I think the difference between these two MacBooks is about hardwares.
*The problem*
1. Connect the MacBook Pro (A) to AP+Router.
2. Receive IPv6 router advertisement from the router. (router lifetime=1800, valid lifetime=2592000, preferred lifetime=604800)
3. Assign both IPv6 EUI-64 address and temporary address.
4. Receive IPv6 router advertisement from the router again, 70 sec after previous one.
5. Both the EUI-64 and temporary addresses are removed, and then same EUI-64 address and _new_ temporary address are assigned.
The problem here is that MacBook Pro (A) configures _new_ temporary address, or it removes old temporary address. This causes additional issues on TCP connections because TCP sessions become no longer available after the temporary address has changed.
This problem is not experienced my old MacBook Pro (B); i.e., it keeps the temporary address even after receiving router advertisements.
All the data and setting in MacBook Pro (A) are transferred from MacBook Pro (B).
Therefore, I think the problem is due to hardwares.
I prefer to use IPv6 because I'm in a networking group and also prefer to use temporary addresses.
Do you experience same problem or any suggestions to me?
If you need additional environment description, please ask me.
Thank you in advance, and sorry for my poor English.
Message was edited by: scyphus

This bug has been stealthily fixed in the update http://support.apple.com/kb/HT4250 today, though I have received no reply from Apple bug reporter site.

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I was wrong. The MTU in IPv6 router advertisements is not ignored by my Mac. In fact, it works great. A few things threw me off here:
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Reassigning IPv6 temporary address when it receives router advertisements

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