DHCPv6: CentOS 7 Server & Mikrotik Client

IPv6 DHCP configuration with CentOS 7 as DHCP server and Mikrotik as DHCPv6 client.

Note: Assumed you already have configured an IPv6 from subnet  on server interface. You may follow this guide.

Subnet:  2000:5a40:0:12::/64

Gateway IP: 2000:5a40:0:12::1/64

Subnet Range: 2000:5a40:0:12::100-200

 

1. Verify that, DHCP package is installed

# yum list installed | grep dhcp

dhcp.x86_64 12:4.2.5-68.el7.centos.1 @updates
dhcp-common.x86_64 12:4.2.5-68.el7.centos.1 @updates
dhcp-libs.x86_64 12:4.2.5-68.el7.centos.1 @updates

If not installed, you may install via yum

# yum install -y dhcp

 

2. Edit configuration file and restart service

# vi /etc/dhcp/dhcpd6.conf

default-lease-time 3600; # 1 hour
max-lease-time 86400; # 1 day
authoritative;
allow leasequery;
dhcpv6-lease-file-name “/var/lib/dhcpd/dhcpd6.leases”;


subnet6 2000:5a40:0:12::/64 {
#any of following range declaration format is supported
#range6 2000:5a40:0:12::100 2000:5a40:0:12::200;
range6 2000:5a40:0:12::100/120;
option dhcp6.name-servers 2001:4860:4860::8888;
option dhcp6.domain-search "jalam.me";
}

# systemctl start dhcpd6

# systemctl enable dhcpd6

 

3. Mikrotik client configuration

IPv6 is disabled on Mikrotik by default.

If disable enable the package and reboot the router

configuration on Mikrotik

[admin@Mikrotik] > /ipv6 dhcp-client add interface=ether2 request=address

 

4. verification

on Mikrotik

[admin@Mikrotik] > /ipv6 dhcp-client print 

Flags: D - dynamic, X - disabled, I - invalid 
# INTERFACE   STATUS   REQUEST   PREFIX  ADDRESS 
0 ether2      bound    address           2000:5a40:0:12::1d6, 51m45s 


[admin@Mikrotik] > /ipv6 address print 
Flags: X - disabled, I - invalid, D - dynamic, G - global, L - link-local 
# ADDRESS                        FROM-POOL INTERFACE ADVERTISE
0 DL fe80::e97:42ff:fef5:7a00/64             ether1     no 
1 DL fe80::e97:42ff:fef5:7a02/64             ether3     no 
2 DL fe80::e97:42ff:fef5:7a03/64             ether4     no 
3 DL fe80::e97:42ff:fef5:7a01/64             ether2     no 
4 DG 2401:5a40:0:12::1d6/64                  ether2     no 


[admin@Mikrotik] > ping 2401:5a40:0:12::1 count=1 

SEQ  HOST               SIZE   TTL   TIME   STATUS 
0    2401:5a40:0:12::1   56    64    3ms    echo reply 

sent=1 received=1 packet-loss=0% min-rtt=3ms avg-rtt=3ms max-rtt=3ms 

on server

# cat /var/lib/dhcpd/dhcpd6.leases


# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.2.5

server-duid "\000\001\000\001\"\265\204\217\000\014)\\f\025";

ia-na "\002\000\000\000\000\003\000\001\014\227B\365z\000" {
cltt 5 2018/06/15 10:42:22;
iaaddr 2000:5a40:0:12::1d6 {
binding state active;
preferred-life 2250;
max-life 3600;
ends 5 2018/06/15 11:42:22;
}
}

 

References:

• https://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/ch22s06.html
• https://wiki.mikrotik.com/wiki/Manual:IPv6/DHCP_Client