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IPv6 CASA C2200

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IPv6 CASA C2200

Hello, I am trying to get CASA C2200 IPv6 up and running. I have made static CPE settings work. The Internet is accessible from this address. Everything works with a PC directly behind the modem. If the router is connected to the modem, it pings from the WAN address but does not ping from the LAN. Please if anyone has IPv6 running on CASA, if they could provide config. Thank you very much

where I got

I managed to get the CPE getting an address and a delegated prefix. Unfortunately, the CPE is assigned the DHCPv6 server address as the default gateway, which is also the same cable-helper.
So far I have not been able to find out where the default gateway of CASA is set for IPv4 is in the dhcp.conf option router.
For IPv6 this should probably be set directly in config CMTS.
I apologize for my English

here is the CMTS config:
interface ip-bundle 1
ip address
ip address c.c.c.1 secondary
ipv6 address xxxx:xxxx:1:2::1/64 secondary
cable helper-address
cable helper-ipv6-address fc00:2880:1:1::3

interface gige 0
ip address
ipv6 address fc00:2880:1:1::2/64
no shutdown

interface gige 1

interface gige 2

interface gige 3
ip address


route net 0 gw 24
route6 net ::/0 gw fc00:2880:1:1::1

interface docsis-mac 1
no shutdown
ip-provisioning-mode dual-stack
no early-authentication-encryption
no multicast-dsid-forward
no tftp-proxy
ip bundle 1
downstream 1 interface qam 0/0/0
downstream 2 interface qam 0/1/0
downstream 3 interface qam 0/2/0
downstream 4 interface qam 0/3/0
upstream 1 interface upstream 1/0/0
upstream 2 interface upstream 1/1/0
upstream 3 interface upstream 1/2/0
upstream 4 interface upstream 1/3/0

here is the config dhcp6.conf:
ddns-update-style none;
option space docsis code width 2 length width 2 hash size 17;
option docsis.tftp-server code 32 = array of ip6-address;
#option routers code 39 = array of ip6-address;
option docsis.cablelabs-configuration-file code 33 = text;
option docsis.cablelabs-syslog-servers code 34 = array of ip6-address;
option docsis.device-id code 36 = string;
option docsis.time-servers code 37 = array of ip6-address;
option docsis.time-offset code 38 = signed integer 32;
#option vsio.docsis code 4491 = encapsulate docsis;
option dhcp6.name-servers xxxx:xxxx::53;
option dhcp6.preference 255;
option dhcp6.rapid-commit;

subnet6 fc00:2880:1:1::/64 {}
#----------- CPE ( eRouter ) DHCP options -----------------

option dhcp6.leased-address code 194 = string;
option dhcp6.leased-address = binary-to-ascii(16,16, ":", substring(suffix(option dhcp6.ia-na, 24),0,16));
option dhcp6.macaddr code 193 = string;
option dhcp6.macaddr = binary-to-ascii(16, 8, ":", suffix(option dhcp6.client-id, 6));

default-lease-time 6000;
max-lease-time 7200;
log-facility local7;
subnet6 xxxx:xxxx:1:2::/64 { log (info, concat ("Lease for ",config-option dhcp6.leased-address, " leased to ", config-option dhcp6.macaddr));
range6 xxxx:xxxx:1:2::1:0 xxxx:xxxx:1:2:ffff:ffff:ffff:ffff;

prefix6 xxxx:xxxx:1:0500:: xxxx:xxxx:1:ff00::/56;
host CPE { hardware ethernet 04:4d:28:35:35:28;fixed-address6 xxxx:xxxx:1:2:10:10:10:88; }

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