Hi
When my firewall talks IPv6 to my uplink I see the following
The firewall asks for MAC of my uplink and gets an answer
24.591703 XXXX:YYYY:0:6::99 XXXX:YYYY:0:6::1
ICMPv6 86 Neighbor
Solicitation for XXXX:YYYY:0:6::1 from xx:xx:xx:e8:34:28
24.599421 XXXX:YYYY:0:46::1 XXXX:YYYY:0:6::99
ICMPv6 86 Neighbor
Advertisement XXXX:YYYY:0:6::1 (rtr, sol, ovr) is at yy:yy:yy:00:02:06
Please note that the reply comes from another IPv6 address (on same router)
than the one being asked for.
In NDP tables (by refreshing fast) I notice that the TTL counts like below
24h00m00s
23h59m59s
23h59m58s
23h59m57s
23h59m56s
15s
14s
:
1s
expired
24h00m00s
23h59m59s
:
And so on
Can anyone explain the TTL behavior ? And how I control it ?
The router announcement from my router looks like this:
Frame 31: 150 bytes on wire (1200 bits), 150 bytes captured (1200 bits)
Internet Control Message Protocol v6
Type: Router Advertisement (134)
Code: 0
Checksum: 0x7a53 [correct]
[Checksum Status: Good]
Cur hop limit: 64
Flags: 0x80
1... .... = Managed address configuration: Set
.0.. .... = Other configuration: Not set
..0. .... = Home Agent: Not set
...0 0... = Prf (Default Router Preference): Medium (0)
.... .0.. = Proxy: Not set
.... ..0. = Reserved: 0
Router lifetime (s): 7200
Reachable time (ms): 1800000
Retrans timer (ms): 0
ICMPv6 Option (Source link-layer address : zz:zz:zz:e2:bb:20)
Type: Source link-layer address (1)
Length: 1 (8 bytes)
Link-layer address: Router_e2:bb:20 (zz:zz:zz:e2:bb:20)
ICMPv6 Option (MTU : 1500)
Type: MTU (5)
Length: 1 (8 bytes)
Reserved
MTU: 1500
ICMPv6 Option (Prefix information : XXXX:YYYY:0:46::/64)
Type: Prefix information (3)
Length: 4 (32 bytes)
Prefix Length: 64
Flag: 0x80
1... .... = On-link flag(L): Set
.0.. .... = Autonomous address-configuration flag(A): Not set
..0. .... = Router address flag(R): Not set
...0 0000 = Reserved: 0
Valid Lifetime: 7200
Preferred Lifetime: 3600
Reserved
Prefix: XXXX:YYYY:0:46::
ICMPv6 Option (Prefix information : XXXX:YYYY:0:6::/64)
Type: Prefix information (3)
Length: 4 (32 bytes)
Prefix Length: 64
Flag: 0x80
1... .... = On-link flag(L): Set
.0.. .... = Autonomous address-configuration flag(A): Not set
..0. .... = Router address flag(R): Not set
...0 0000 = Reserved: 0
Valid Lifetime: 7200
Preferred Lifetime: 3600
Reserved
Prefix: XXXX:YYYY:0:6::
Thanks
Claus
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