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RV320, IPv6 Addresses only assigned to clients in Vlan1



I am using a RV320 on 2 VDSL-links (DS-Lite), configured for load-balancing. The RV320 is connected to the 2 upstream ISP’s router’s LAN ports. These 2 routers provide the RV320 with their respective IPv6 addresses and network prefixes through router advertisement.


Each RV320’s WAN port is getting an IPv6 address and all needed information assigned. No issue there.


When I connect a PC to one of the RV320’s LAN ports, which is assigned to VLAN1, I get IPv6 addresses assigned to the PC from both links, and am able to actually connect to the outside world over IPv6 through either link.


This is what the address assignment looks like on the PC’s network interface. Even though in German, it should be quite easy for English speakers to figure out the meaning. No issue there, everything is as it should be.




Ethernet-Adapter Ethernet:

   Verbindungsspezifisches DNS-Suffix:

   IPv6-Adresse. . . . . . . . . . . : 2001:a61:4006:aef4:x:x

   IPv6-Adresse. . . . . . . . . . . : 2001:a61:4006:aef4:x:x:x:x

   IPv6-Adresse. . . . . . . . . . . : 2001:a61:400c:8fec:x:x

   IPv6-Adresse. . . . . . . . . . . : 2001:a61:400c:8fec:x:x:x:x

   IPv6-Adresse. . . . . . . . . . . : fc00::35bd:2f49:x:x

   Temporäre IPv6-Adresse. . . . . . : 2001:a61:4006:aef4:x:x:x:x

   Temporäre IPv6-Adresse. . . . . . : 2001:a61:400c:8fec:x:x:x:x

   Temporäre IPv6-Adresse. . . . . . : fc00::7011:f3a3:x:x

   Verbindungslokale IPv6-Adresse . : fe80::35bd:2f49:x:x

   IPv4-Adresse . . . . . . . . . . :

   Subnetzmaske . . . . . . . . . . :

   Standardgateway . . . . . . . . . : fe80::b2aa:77ff:x:x



Connecting the same PC to another RV320’s LAN port that is assigned to one of the other VLANs, in this example VLAN 10, I am only getting below addressing scheme assigned to the PCs network interface.


As you can see, all IPv6 address-information are gone/not passed on, apart of the local IPv6 address.



Ethernet-Adapter Ethernet:

   Verbindungsspezifisches DNS-Suffix:

   Verbindungslokale IPv6-Adresse . : fe80::35bd:2f49:x:x

   IPv4-Adresse . . . . . . . . . . :

   Subnetzmaske . . . . . . . . . . :

   Standardgateway . . . . . . . . . :


With this assignment, communication to the outside world over IPv6 for any client in this VLAN is impossible. This is also the case for all other 4 VLANS that I created on the RV320. Communication over IPv4 however works as expected.


I have been trying for 1 week now to find a solution, have been reading various documents, FAQs, instructions on the RV320 and IPv6 in general, been watching videos, seeking through forums, but somehow I still can’t figure out the root cause of this issue in order to fix it.


The RV320 is configured as DHCP server for every VLAN for IPv4 and IPv6.


Any idea what I am doing wrong here or did I hit a limitation of the RV320?

Before I configured the device, I updated to the latest firmware v1.2.1.14 and reset to factory defaults.



Any idea anyone?

Any idea anyone?

The issue is easy to understand, despite the wall of text above:

Why do clients only in Vlan1 get routable IPv6 addresses assigned through DHCP?

There is no trace of routable IPv6 addresses on any client, connected to any other Vlan, even though DHCP is enabled.

Any thoughts?

Cisco Employee

there was this bug CSCut07168

there was this bug CSCut07168 that was resolved in here is text on it

Problem Description:
-  When DHCP Server is disabled for all VLAN except one, DHCP doesn't work
-  VLAN 1 is the only one that works when it is the only one with DHCP Server enabled
-  If DHCP Server is enabled on any other VLAN, then DHCP works for those VLANs
-  Ex.  VLANs 1,2 and 3 have DHCP disabled and VLAN 4 has it enabled.  DHCP doesn't work for VLAN 4
-  When DHCP Server is disabled for all VLAN except one, DHCP doesn't work
-  VLAN 1 is the only one that works when it is the only one with DHCP Server enabled

-  DHCP Server is disabled on all VLANs except one (other than VLAN 1)

-  Enable DHCP Server on any other VLAN
-  Can create a dummy VLAN that is not assigned to a port

Steps to Reproduce:

1.  Create VLAN 4 so that VLANS 1,25,100 and 4 exist on the router

2.  Disable DHCP Server on VLANs 1, 25 and 100

3.  Enable DHCP Server on VLAN 4

4.  Put a port in VLAN 4 untagged

5.  Connect a PC to port in VLAN 4
It will not get an ip address via DHCP


6.  Create VLAN 5 and enable DHCP Server

7.  Don't put any ports in VLAN 5 untagged

8.  Connect PC to port in VLAN 4
It will now get an ip address via DHCP

What if you you assign a static IPv6 address to host in Vlan 10, does it work okay?

could you provide me

show ipv6 interface vlan 10

are you using following utility to configure it? --> I used it to test what you have

config doc:



Re: there was this bug CSCut07168

On RV320 I'm not able to use something like "show ipv6 interface vlan 10".

Only "access-list" and "interface vlan" commands are available (v1.4.2.19).