Multiple interfaces with same IP address?

Can anyone suggest how to configure multiple (logical or physical) interfaces with the same IP address?
There is a teaser in the solaris 8 man page for 'route' that suggests this is possible:
"In a change or add command where the destination and gateway are not sufficient to specify the route (for example, , when several interfaces have the same address), the -ifp or -ifa modifiers may be used to determine the interface or interface address."
I can find no other reference to -ifp or -ifa, and at the moment I cannot seem to bring up two interfaces (logical or physical) with the same ip address.
I realise this is an obscure config. Anyone intimately familiar with route of ifconfig?
AJB

Yes. I could have laid odds that this would be the first response :-)
I know it is unusual, and I am aware of the inherent issues with doing something like this. I have read the multipathing guide, but it wasn't that helpful, because I want the same IP address, not just the same subnet. It is NOT for load balancing, or failover support. I'm afraid I can't give too much detail at the moment because of the nature of research project. What I will add is that I want to do this on an 802.1q enabled NIC, on the same physical port, with different logical interfaces for each VLAN having the SAME IP address.
We can already do this on Linux, and as I said in the original post, the route man page suggests that it can probably be done on Solaris. What I really need to know is how?
Any takers?
AJB

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Yes. I could have laid odds that this would be the first response :-)
I know it is unusual, and I am aware of the inherent issues with doing something like this. I have read the multipathing guide, but it wasn't that helpful, because I want the same IP address, not just the same subnet. It is NOT for load balancing, or failover support. I'm afraid I can't give too much detail at the moment because of the nature of research project. What I will add is that I want to do this on an 802.1q enabled NIC, on the same physical port, with different logical interfaces for each VLAN having the SAME IP address.
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c2960 configured to allow only one device per port with no Mac-Bypass and no critical auth.
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Sure. Tried to make it short.
Config for 802.1x-aaa:
aaa new-model
aaa group server radius default
server X.X.X.X auth-port 12345 acct-port 12346
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aaa authentication dot1x default group radius
aaa authorization exec default group radius if-authenticated
aaa authorization network default local group radius
aaa authorization reverse-access default group radius
aaa accounting suppress null-username
aaa accounting update periodic 1
aaa accounting dot1x default start-stop group radius
aaa accounting exec default start-stop group radius
aaa accounting network default start-stop group radius
aaa accounting system default start-stop group radius
aaa session-id common
dot1x system-auth-control
interface FastEthernet0/48
switchport access vlan 1398
switchport mode access
dot1x pae authenticator
dot1x port-control auto
dot1x violation-mode shutdown
spanning-tree portfast
spanning-tree link-type point-to-point
radius-server attribute 44 include-in-access-req
radius-server attribute 44 extend-with-addr
radius-server attribute 188 format non-standard
radius-server attribute 218 mandatory
radius-server attribute 32 include-in-accounting-req format %i %h %d
radius-server attribute 55 include-in-acct-req
radius-server attribute list att
attribute 30-31,44
radius-server host X.X.X.X auth-port 12345 acct-port 12346 key keykeykey
radius-server vsa send accounting
sh dot1x int fa 0/48 det
Dot1x Info for FastEthernet0/48
PAE                       = AUTHENTICATOR
PortControl               = AUTO
ControlDirection          = Both
HostMode                  = SINGLE_HOST
Violation Mode            = SHUTDOWN
ReAuthentication          = Disabled
QuietPeriod               = 60
ServerTimeout             = 0
SuppTimeout               = 30
ReAuthPeriod              = 3600 (Locally configured)
ReAuthMax                 = 2
MaxReq                    = 2
TxPeriod                  = 30
RateLimitPeriod           = 0
Dot1x Authenticator Client List Empty
Port Status               = UNAUTHORIZED
And right now, while port is UNAUTHORIZED we have 2 sessions as follows:
sh aaa user all
Unique id 34974 is currently in use.
Accounting:
log=0x208241
Events recorded :
    CALL START
    ATTR REPLACE
    NET UP
    INTERIM START
    VPDN NET UP
update method(s) :
    PERIODIC
update interval = 60
Outstanding Stop Records : 0
Dynamic attribute list:
    0244DC34 0 00000001 connect-progress(44) 4 Auth Open
    0244DC48 0 00000001 pre-session-time(272) 4 0(0)
    0244DC5C 0 00000001 elapsed_time(339) 4 4828941(49AF0D)
    0244DC70 0 00000001 input-giga-words(111) 4 2(2)
    0244DC84 0 00000001 output-giga-words(250) 4 8(8)
    024A8C10 0 00000001 bytes_in(112) 4 119041621(7186E55)
    024A8C24 0 00000001 bytes_out(252) 4 3588031221(D5DD02F5)
    024A8C38 0 00000001 pre-bytes-in(268) 4 7373(1CCD)
    024A8C4C 0 00000001 pre-bytes-out(269) 4 8204(200C)
    024A8C60 0 00000001 paks_in(113) 4 45940138(2BCFDAA)
    024A8CB0 0 00000001 paks_out(253) 4 46979788(2CCDACC)
    024A8CC4 0 00000001 pre-paks-in(270) 4 68(44)
    024A8CD8 0 00000001 pre-paks-out(271) 4 61(3D)
No data for type EXEC
No data for type CONN
NET: Username=(n/a)
    Session Id=000088AD Unique Id=0000889E
    Start Sent=0 Stop Only=N
    stop_has_been_sent=N
    Method List=0
    Attribute list:
      024CAA00 0 00000001 session-id(336) 4 34989(88AD)
      024CAA14 0 00000001 start_time(342) 4 Jan 23 2012 16:22:08
No data for type CMD
No data for type SYSTEM
No data for type RM CALL
No data for type RM VPDN
No data for type AUTH PROXY
8: Username=157102
    Session Id=000088AD Unique Id=0000889E
    Start Sent=1 Stop Only=N
    stop_has_been_sent=N
    Method List=226B3E4 : Name = default
    Attribute list:
      0244DB94 0 00000001 session-id(336) 4 34989(88AD)
      0244DBA8 0 00000001 start_time(342) 4 Jan 23 2012 16:22:08
      0244DBBC 0 00000009 audit-session-id(599) 24 0AC5010200001C45A5C67429
No data for type IPSEC-TUNNEL
No data for type RESOURCE
No data for type 11
No data for type 12
No data for type CALL
No data for type VPDN-TUNNEL
No data for type VPDN-TUNNEL-LINK
Debg: No data available
Radi: 2032FD8
Interface:
TTY Num = -1
Stop Received = 0
Byte/Packet Counts till Call Start:
    Start Bytes In = 993512241     Start Bytes Out = 3867828098
    Start Paks In = 23586320      Start Paks Out = 28511581
Byte/Packet Counts till Service Up:
    Pre Bytes In = 993519614     Pre Bytes Out = 3867836302
    Pre Paks In = 23586388      Pre Paks Out = 28511642
Cumulative Byte/Packet Counts :
    Bytes In = 1112561235    Bytes Out = 3160900227
    Paks In = 69526526      Paks Out = 75491430
StartTime = 16:22:08 GMT+5 Jan 23 2012
AuthenTime = 16:22:08 GMT+5 Jan 23 2012
Component = DOT1X
Authen: service=8021X type=EAP method=RADIUS
Kerb: No data available
Meth: No data available
PreA: No data available
General:
Unique Id = 0000889E
Session Id = 000088AD
Attribute List:
    024A8C10 0 00000001 port-type(174) 4 Ethernet
    024A8C24 0 00000009 interface(170) 16 FastEthernet0/48
    024A8C38 0 00000009 dnis(50) 17 00-18-B9-F5-5B-30
    024A8C4C 0 00000009 clid(37) 17 48-5B-39-EA-26-7C
PerU: No data available
Unique id 34976 is currently in use.
Accounting:
log=0x10000208241
Events recorded :
    CALL START
    ATTR REPLACE
    NET UP
    INTERIM START
    VPDN NET UP
    SESSION INFO
update method(s) :
    PERIODIC
update interval = 60
Outstanding Stop Records : 0
Dynamic attribute list:
    024CAA00 0 00000001 connect-progress(44) 4 Auth Open
    024CAA14 0 00000001 pre-session-time(272) 4 2(2)
    024CAA28 0 00000001 elapsed_time(339) 4 4828961(49AF21)
    024CAA3C 0 00000001 input-giga-words(111) 4 2(2)
    024CAA50 0 00000001 output-giga-words(250) 4 8(8)
    024CAAA0 0 00000001 bytes_in(112) 4 119021816(71820F8)
    024CAAB4 0 00000001 bytes_out(252) 4 3588011179(D5DCB4AB)
    024CAAC8 0 00000001 pre-bytes-in(268) 4 6219(184B)
    024CAADC 0 00000001 pre-bytes-out(269) 4 7005(1B5D)
    024CAAF0 0 00000001 paks_in(113) 4 45939933(2BCFCDD)
    0244DB94 0 00000001 paks_out(253) 4 46979618(2CCDA22)
    0244DBA8 0 00000001 pre-paks-in(270) 4 59(3B)
    0244DBBC 0 00000001 pre-paks-out(271) 4 51(33)
No data for type EXEC
No data for type CONN
NET: Username=(n/a)
    Session Id=000088AF Unique Id=000088A0
    Start Sent=0 Stop Only=N
    stop_has_been_sent=N
    Method List=0
    Attribute list:
      024A8C10 0 00000001 session-id(336) 4 34991(88AF)
      024A8C24 0 00000001 start_time(342) 4 Jan 23 2012 16:22:18
No data for type CMD
No data for type SYSTEM
No data for type RM CALL
No data for type RM VPDN
No data for type AUTH PROXY
8: Username=157102
    Session Id=000088AF Unique Id=000088A0
    Start Sent=1 Stop Only=N
    stop_has_been_sent=N
    Method List=226B3E4 : Name = default
    Attribute list:
      024CAA00 0 00000001 session-id(336) 4 34991(88AF)
      024CAA14 0 00000001 start_time(342) 4 Jan 23 2012 16:22:18
      024CAA28 0 00000009 audit-session-id(599) 24 0AC5010200001C49A5C6990F
No data for type IPSEC-TUNNEL
No data for type RESOURCE
No data for type 11
No data for type 12
No data for type CALL
No data for type VPDN-TUNNEL
No data for type VPDN-TUNNEL-LINK
Debg: No data available
Radi: 2032F58
Interface:
TTY Num = -1
Stop Received = 0
Byte/Packet Counts till Call Start:
    Start Bytes In = 993533200     Start Bytes Out = 3867849339
    Start Paks In = 23586534      Start Paks Out = 28511761
Byte/Packet Counts till Service Up:
    Pre Bytes In = 993539419     Pre Bytes Out = 3867856344
    Pre Paks In = 23586593      Pre Paks Out = 28511812
Cumulative Byte/Packet Counts :
    Bytes In = 1112561235    Bytes Out = 3160900227
    Paks In = 69526526      Paks Out = 75491430
StartTime = 16:22:18 GMT+5 Jan 23 2012
AuthenTime = 16:22:19 GMT+5 Jan 23 2012
Component = DOT1X
Authen: service=8021X type=EAP method=RADIUS
Kerb: No data available
Meth: No data available
PreA: No data available
General:
Unique Id = 000088A0
Session Id = 000088AF
Attribute List:
    0244DB94 0 00000001 port-type(174) 4 Ethernet
    0244DBA8 0 00000009 interface(170) 16 FastEthernet0/48
    0244DBBC 0 00000009 dnis(50) 17 00-18-B9-F5-5B-30
    0244DBD0 0 00000009 clid(37) 17 48-5B-39-EA-26-7C
PerU: No data available
PS. Have no command "show authentication"

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Hi - I have no problem connecting to multiple Macs behind a single IP (router) using different ports, port forwarding, dyndns, etc., etc.
The problem I'm having is that in the list of computers in ARD, it won't let you have more than one with the same IP address. When you create the second with the same IP, it clears the first one, giving it an IP of 0.0.0.0. They are on different ports, but that's not counted as part of the IP, so it still gets cleared. I use different dyndns domain names, but ARD instantly converts them to an IP when creating the entry, so that doesn't help either.
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Multiple interfaces with same IP address?

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