Connecting using IPv6?

A while ago I posted a question about a problem I had using networked Eudora after upgrading to Tiger from Panther on machines on my network. See the quoted text below first...
I have since found that the only mac on my network that still works using Tiger/network Eudora appears to connect to my 10.3.9 Server using afp and IPv6.
So on the Tiger machines that don't work when I click on the mounted volume I get "Server: afp://192.168.254.100/Email_FS" which is just IPv4 and when I go to the Tiger machine that does work with Eudora and I click on the mounted volume to check how I've connected I get "Server:afp//[fe80:0000:0000:0000:0203:93ff:fe8d:68e4]:Email_FS"
So - I've also tried connecting using IPv6 on the macs that don't work with Eudora - just going to Go -> Network and typing in the IPv6 address to connect to my server - and my mac won't connect that way. (Network preferences IPv6 is enabled)
Anyone have any idea why one of my macs is connecting using IPv6?
Anyone have any idea if this might be the cause of my problem?
Anyone have any idea how I can force my other macs to connect using IPv6 to see if this is the solution to my Eudora problem?
Thanks for your help as ever...
Original Eudora question:
I have just upgraded the system software on an iMac on my network to Tiger from Panther (to 10.4.8 from 10.3.9), and now my Eudora will not check mail - instead it gives an error message.
The mac uses Eudora for mac 6.23 and OSX 10.4.8
My Eudora folders (mail folders) are accessed over the network (mail folders and are on a volume of a MacOSX server 10.3.9), so that they are backed up and can be accessed from any machine. The settings are launched directly by double clicking on an alias to them from the dock.
I have two other macs on the network using this arrangement of Tiger and Eudora 6.23 and they have no problems.
However when I click on my settings file from this particular mac I get the following error message:
44886+ 1(-5000)
An Unknown Error Occurred (90:913)
It is not possible to collect mail.
And then I get a message that I cannot use background threading.
I can see all of the existing mail - I just can't collect new mail or send mail.
- Obviously there are no problems with the pop settings as I can use this settings file to check/send mail from any other machine on my network
- However, on this particular machine I get this error regardless of which Eudora settings I try open and check mail for - including the ones that open successfully across the network from the other OSX 10.4 machines
- I have also created a new settings file/Eudora Folder and copied this across to the network to see if that would open/check mail (it didn't)
- I have also reinstalled Eudora from the .dmg file
- I have run disk permissions on the Mac before and after running the OSX update
- If I copy the settings across to the local hard drive, Eudora works OK - so it seems to be some network setting - although this machine has the same settings as the others (manual NAT IP address).
- I've checked firewall settings, TCP/IP settings and the like to see if I can see any differences between the Tiger machine that will collect mail and the one that won't, but they appear to be configured in the same way
- I've created a new user on the problematic mac and tried to launch from that - doesn't work either
- I've tried throwing away network plist kind of files as well.
Anyone help me out there?
Thanks a million!

Hi Jermy,
Unlike in ipv4, in ipv6 a static route with only the egress interface should only be used on a point to point interface. This is because ipv4 has concept of proxy arp, which ipv6 doesn't have. For your config to work, you should add the next-hop ipv6 address to your static route as follow:
router:
ipv6 route ::/0 2001:610:1111::2
switch:
ipv6 route ::/0 2001:610:1000::2
Hope this helps

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