IPv6 Prefix Delegation on a Cisco 887VA behind a XS4All VDSL2 connection

XS4All connection

At the PCextreme office we have a XS4All VDSL2 connection which has native IPv6. We get a /48 from XS4All.

I wrote two earlier blogposts about getting the Cisco 887VA router setup which might be of interest before you continue reading:

IPv6 Prefix Delegation

From XS4All we get a /48 routed to our office using DHCPv6 Prefix Delegation. We are experimenting and testing with Docker at the office where we also want to test the IPv6 capabilities of Docker.

The goal was to sub-delegate /60 subnets out of a /56 towards clients internally. I had to figure out how to get this configured on Cisco IOS.

  • We get a /48 delegated from XS4All
  • The first /56 is used for our local networks (LAN, Guest and Servers)
  • The second /56 is used as a pool to delegate /60 subnets from


To calculate the IPv6 subnets used the tool ‘sipcalc’. I needed to find the second /56 in our /48:

sipcalc -S 56 2001:980:XX::/48

The output is rather long, so I trimmed it a bit:

-[ipv6 : 2001:980:XX::/48] - 0

[Split network]
Network			- 2001:0980:XX:0000:0000:0000:0000:0000 -
Network			- 2001:0980:XX:0100:0000:0000:0000:0000 -
Network			- 2001:0980:XX:0200:0000:0000:0000:0000 -
Network			- 2001:0980:XX:ff00:0000:0000:0000:0000 -


In this case 2001:0980:XX:0100:0000:0000:0000:0000:/56 is the second /56 in our /48.

Cisco IOS

Some searching brought me to cisco.com which had some examples.

Eventually it was actually quite easy to get it working.


You need a DHCPv6 pool inside the Cisco and tell it to start a DHCPv6 server on the proper interface.

ipv6 dhcp pool local-ipv6
 prefix-delegation pool local-ipv6-pd-pool lifetime 3600 1800
 dns-server 2001:888:0:6::66
 dns-server 2001:888:0:9::99
 domain-name pcextreme.nl
interface Vlan1
 ip address
 ip nat inside
 ip virtual-reassembly in
 ipv6 address xs4all-prefix ::1/64
 ipv6 enable
 ipv6 nd other-config-flag
 ipv6 nd ra interval 30
 ipv6 nd ra dns server 2001:888:0:6::66
 ipv6 nd ra dns server 2001:888:0:9::99
 ipv6 dhcp server local-ipv6 rapid-commit
 ipv6 mld query-interval 60
ipv6 local pool local-ipv6-pd-pool 2001:980:XX:100::/56 60

That’s all!

Asking for a Prefix

On my Ubuntu desktop I could now request a subnet:

wido@wido-desktop:~$ sudo dhclient -6 -P -v eth0
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Bound to *:546
Listening on Socket/eth0
Sending on   Socket/eth0
PRC: Soliciting for leases (INIT).
XMT: Forming Solicit, 0 ms elapsed.
XMT:  X-- IA_PD d5:68:28:08
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on eth0, interval 1060ms.
RCV: Advertise message on eth0 from fe80::da67:d9ff:fe81:bcec.
RCV:  X-- IA_PD d5:68:28:08
RCV:  | X-- starts 1455279332
RCV:  | X-- t1 - renew  +900
RCV:  | X-- t2 - rebind +1440
RCV:  | X-- [Options]
RCV:  | | X-- IAPREFIX 2001:980:XX:100::/60
RCV:  | | | X-- Preferred lifetime 1800.
RCV:  | | | X-- Max lifetime 3600.
RCV:  X-- Server ID: 00:03:00:01:d8:67:d9:81:bc:f0
RCV:  Advertisement recorded.
PRC: Selecting best advertised lease.

As you can see I got 2001:980:XX:100::/60 delegated to my desktop.

IPv6 routes

After I asked for a subnet on my desktop this is how the routes look like. You can see a /60 being routed to my Link-Local Address.

firewall-vdsl-veldzigt#show ipv6 route
IPv6 Routing Table - default - 8 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP
       H - NHRP, D - EIGRP, EX - EIGRP external, ND - ND Default
       NDp - ND Prefix, DCE - Destination, NDr - Redirect, O - OSPF Intra
       OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1
       ON2 - OSPF NSSA ext 2, la - LISP alt, lr - LISP site-registrations
       ld - LISP dyn-eid, a - Application
S   ::/0 [1/0]
     via Dialer0, directly connected
S   2001:980:XX::/48 [1/0]
     via Null0, directly connected
C   2001:980:XX::/64 [0/0]
     via Vlan1, directly connected
L   2001:980:XX::1/128 [0/0]
     via Vlan1, receive
C   2001:980:XX:1::/64 [0/0]
     via Vlan300, directly connected
L   2001:980:XX:1::1/128 [0/0]
     via Vlan300, receive
S   2001:980:XX:100::/60 [1/0]
     via FE80::C23F:D5FF:FE68:XX, Vlan1
L   FF00::/8 [0/0]
     via Null0, receive

The subnet is working now and I can use it to hand it out to my Docker containers.

Cisco 887VA with VDSL2 vectoring on XS4All/KPN

Note: This post is in Dutch since it’s targeted towards a Dutch audience.

Vandaag werd op kantoor onze VDSL2 verbinding van 50Mbit (non-vectoring) naar 65Mbit (vectoring) geupgrade door XS4All. Dat liep niet helemaal lekker. Onze Cisco 887VA router/modem kon daar niet goed mee overweg.

Na wat zoeken (uren) kwam ik er achter dat er een andere firmware nodig is, te weten VA_A_38k1_B_38h_24g1.bin

Om iedereen de moeite te besparen, deze firmware is hier te downloaden. (Hekel aan dat Cisco alles achter logins plaatst!)

Plaats vervolgens de firmware in de router door middel van TFTP of een HTTP-copy en dan is het slechts dit stukje configuratie:

controller VDSL 0
 firmware filename flash:VA_A_38k1_B_38h_24g1.bin

Als ik nu in de Cisco kijk zie ik dit:

firewall#show controllers VDSL 0
Controller VDSL 0 is UP

Daemon Status:		 Up 

			XTU-R (DS)		XTU-C (US)
Chip Vendor ID:		'BDCM'			 'BDCM'
Chip Vendor Specific:   0x0000			 0xA45F
Chip Vendor Country:    0xB500			 0xB500
Modem Vendor ID:	'CSCO'			 '    '
Modem Vendor Specific:  0x4602			 0x0000
Modem Vendor Country:   0xB500			 0x0000
Serial Number Near:    FCZ162390P2 887VA-SE 15.3(3)   
Serial Number Far:     AA1250FE43S-05
Modem Version Near:    15.3(3)
Modem Version Far:     0xa45f

Modem Status:		 TC Sync (Showtime!) 
DSL Config Mode:	 AUTO 
Trained Mode:		 G.993.2 (VDSL2) Profile 17a
TC Mode:		 PTM 
Selftest Result:	 0x00 
DELT configuration:	 disabled 
DELT state:		 not running 
Trellis:		 ON			  ON
SRA: 			 disabled			 disabled
 SRA count: 		 0			 0
Bit swap: 		 enabled			 enabled
 Bit swap count:	 1710			 5
Line Attenuation:	  0.0 dB		  0.0 dB
Signal Attenuation:	  0.0 dB		  0.0 dB
Noise Margin:		 12.1 dB		 26.2 dB
Attainable Rate:	90384 kbits/s		 36750 kbits/s
Actual Power:		 12.4 dBm		 - 1.2 dBm
Per Band Status:       	D1 	D2 	D3 	U0 	U1 	U2 	U3
Line Attenuation(dB):   11.7	28.0	44.0	4.0	21.5	33.8	N/A	
Signal Attenuation(dB): 16.3	27.6	44.0	4.0	20.8	33.3	N/A	
Noise Margin(dB):       12.2	12.2	12.1	26.2	26.1	26.2	N/A	
Total FECC:		54			 0
Total ES:		0			 0
Total SES:		0			 0
Total LOSS:		0			 0
Total UAS:		78			 78
Total LPRS:		0			 0
Total LOFS:		0			 0
Total LOLS:		0			 0

Full inits:		1
Failed full inits:	0
Short inits:		0
Failed short inits:	0

Firmware	Source		File Name (version)
--------	------		-------------------
VDSL		user config	flash:VA_A_38k1_B_38h_24g1.bin (10)

Modem FW  Version:	130208_1314-4.02L.03.A2pv6C038k1.d24g1
Modem PHY Version:	A2pv6C038k1.d24g1
Vendor Version:		Ap6v38k1.24g1 68

 		  DS Channel1	  DS Channel0	US Channel1	  US Channel0
Speed (kbps):	          0	       83997	         0	        8399
SRA Previous Speed:       0	           0	         0	           0
Previous Speed:	          0	           0	         0	           0
Reed-Solomon EC:          0	          54	         0	           0
CRC Errors:	          0	           0	         0	           0
Header Errors:	          0	           0	         0	           0
Interleave (ms):       3.00	        0.00	      0.00	        0.00
Actual INP:	       4.00	       55.00	      4.00	       55.00

Training Log :	Stopped
Training Log Filename :	flash:vdsllog.bin


100% CPU utilization on a Cisco 887VA

Some time ago I wrote a blogpost about using a Cisco 887VA router on a XS4All (dutch ISP) connection. The original article is mostly in Dutch, but I’ll keep this one in English since it will probably help users all over the world.

A couple of days ago I got an e-mail from somebody who read my blogpost and asked me if the 887VA was able to handle more then 25Mbit. I never really tested it since I thought the copper-cable in our office wasn’t that good. During a download I logged into the router and saw that the CPU was 94% utilized!

The VDSL line was however online at 38Mbit, so how could this happen? Was the router underpowered?

I couldn’t wrap my head around it. A brand new VDSL router from Cisco couldn’t handle just 25Mbit? Something had to be wrong.

Some searching brought me to the Cisco Support Forums and one of the suggestions was to turn on CEF. A Cisco technology to improve Layer 3 performance.

Logging in to the router showed me indeed that CEF was disabled for both IPv4 and IPv6.

no ip cef
no ipv6 cef

Enabling CEF was simple:

conf t
ip cef
ipv6 cef

And voila! I suddenly was able to use the full 38Mbit with just ~50% CPU load.

Cisco 887VA on a XS4All VDSL connection

I’m going to write the rest of this post in Dutch, since the ISP I’m going to talk about is dutch.

But, for the international visitors: I had troubles getting our brand new Cisco 887VA-SEC-K9 VDSL modem working on a VDSL connection from XS4All (Dutch ISP). It took me about 8 hours in to figure out that ATM was no longer used..


Afgelopen week werd onze ADSL2+ verbinding op kantoor om gezet naar een VDSL verbinding. Vanaf ons kantoor liggen er enkele IPSec tunnels naar een Cisco ASA5510 in het datacenter. Bij de ADSL2+ verbinding hadden we een SpeedTouch ADSL2+ modem in bridge met daar achter een Cisco ASA5505 die de PPP deed.

Bij de upgrade naar VDSL besloten we om net zoals bij de SDSL verbinding die we hebben een Cisco 880 series router te pakken. Lekker makkelijk je modem + router in één en ook direct onder iOS je IPSec tunnels configureren.

Ik kreeg echter onder geen enkele mogelijkheid de Cisco 887VA werkend op de VDSL verbinding. De geleverde Fritz!Box van XS4All werkte prima, maar bij de 887 bleef de interface “ATM0” maar “down”.

XS4All zou de verbinding in de loop van de dag upgraden naar VDSL, dus ik had in de ochtend de Cisco er al tussen geprikt die toen vrolijk ADSL2+ deed. Nadat XS4All in de ochtend de verbinding naar VDSL omzette stopte alles met werken. ATM0 bleef maar down.

Uren gingen voorbij in waarin ik diverse firmwares geprobeerd heb, allerlei ATM settings, DSL modes, noem het maar op, tót ik een blogpost tegen kwam waar iemand aanhaalde dat er geen ATM meer gebruikt wordt bij VDSL, maar het een native Layer 2 verbinding is. Je moet alleen het VLAN nummer weten.

Waar ik het VLAN nummer gevonden heb weet ik niet meer, maar dit is op het KPN netwerk VLAN nummer 6.

Het duurde toen niet lang voordat ik de verbinding werkend had.

De relevante configuratie:

interface Dialer0
 ip address negotiated
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 dialer pool 1
 dialer idle-timeout 0
 dialer-group 1
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 nd ra interval 30
 ipv6 dhcp client pd xs4all-ipv6 rapid-commit
 ipv6 mld query-interval 60
 ipv6 virtual-reassembly in
 ppp authentication pap callin
 ppp pap sent-username USERNAME@xs4all.nl password 0 PASSWORD
 no cdp enable
 crypto map vpn
interface Ethernet0
 no ip address
interface Ethernet0.6
 encapsulation dot1Q 6
 pppoe enable group global
 pppoe-client dial-pool-number 1
interface ATM0
 no ip address
 no atm ilmi-keepalive
interface Vlan1
 ip address 192.168.X.1
 ip nat inside
 ip virtual-reassembly in
 ipv6 address 2001:980:XXXX::1/64
 ipv6 enable
 ipv6 nd other-config-flag
 ipv6 nd ra interval 30
 ipv6 dhcp server
 ipv6 mld query-interval 60
access-list 100 permit ip 192.168.X.0 any
ip nat inside source route-map nonat interface Dialer0 overload
ip route Dialer0
ipv6 route ::/0 Dialer0
dialer-list 1 protocol ip permit
no cdp run
route-map nonat permit 10
 match ip address 100

De VDSL verbinding trained op 33Mbit down en 3.4Mbit up, dit zie je op een 887VA in met:

show controllers vDSL 0

Onderaan de output zie je vervolgens:

Firmware	Source		File Name (version)
--------	------		-------------------
VDSL		embedded   	VDSL_LINUX_DEV_01212008 (1)

Modem FW  Version:	110331_1212-4.02L.03.A2pv6C032b.d23f
Modem PHY Version:	A2pv6C032b.d23f
Vender Version:		

 		  DS Channel1	  DS Channel0	US Channel1	  US Channel0
Speed (kbps):	          0	       33021	         0	        3432
SRA Previous Speed:       0	           0	         0	           0
Previous Speed:	          0	           0	         0	           0
Reed-Solomon EC:          0	       79025	         0	           0
CRC Errors:	          0	           0	         0	           0
Header Errors:	          0	           0	         0	           0
Interleave (ms):       0.00	       12.00	      0.00	        4.00
Actual INP:	       0.00	        5.00	      0.00	        2.00

Met deze configuratie werkt de VDSL verbinding van XS4All prima met zowel IPv4 als IPv6 (Het is 2012!).

Het is belangrijk om te weten dat je de 887VA-SEC-K9 nodig hebt om IPv6 werkend te krijgen! De standaard 887VA-K9 doet GEEN IPv6.

Overigens zou het wel handig zijn als XS4All de basis VDSL configuratie parameters op hun website zet. Ookal leveren ze (logisch!) geen support op andere modems zijn de parameters wel handig om te weten.