Vodafone is one of the internet providers I use in my home lab setup here in Czechia.
I have been told they can enable IPv6 in my modem/router on request and it is not enabled by default. Anyway, it took them few minutes to reconfigure my modem/router to support IPv6. After this reconfiguratio, I connected my FreeBSD machine to the network segment we use as point-to-point (P2P /30) for IPv4. For IPv6, there is /64 subnet, where I can connect my IPv6 device.
Logical Network schema is depicted below.
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| Logical Network Schema |
Let's start with configuration.
IPv6 Configuration
IPv6 settings can be set dynamically (SLAAC, DHCP6) or statically.
SLAAC Configuration
My FreeBSD System Configuration /etc/rc.conf
hostname="test-ipv6-01.home.uw.cz"
rtsold_enable="YES" # router solicitation daemon
rtsold_flags="-i -m vmx0"
rtsold_enable="YES" # router solicitation daemon
rtsold_flags="-i -m vmx0"
ifconfig_vmx0_ipv6="inet6 accept_rtadv" # WAN Upstream - SLAAC
To apply rc.conf and test SLAAC, I run following commands
- rm /etc/resolv.conf /var/run/resolvconf/interfaces/vmx0:slaac # to test if DNS will be assigned
- service netif restart vmx0 # to apply network configuration from /etc/rc.conf
In such configuration, the WAN interface (vmx0) and routing table looks like this ...
root@test-ipv6-01:~ #ifconfig vmx0vmx0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 options=4e403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS,MEXTPG> ether 00:50:56:81:6e:14 inet6 fe80::250:56ff:fe81:6e14%vmx0 prefixlen 64 scopeid 0x1 inet6 2a02:830a:b00d:5600:250:56ff:fe81:6e14 prefixlen 64 autoconf pltime 2501271 vltime 3365271 media: Ethernet autoselect status: active nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> root@test-ipv6-01:~ #netstat -rn -f inet6Routing tables Internet6: Destination Gateway Flags Netif Expire ::/96 link#3 URS lo0 default fe80::ae22:5ff:fe2c:9485%vmx0 UG vmx0 ::1 link#3 UHS lo0 ::ffff:0.0.0.0/96 link#3 URS lo0 2a02:830a:b00d:5600::/64 link#1 U vmx0 2a02:830a:b00d:5600:250:56ff:fe81:6e14 link#3 UHS lo0 fe80::%lo0/10 link#3 URS lo0 fe80::%vmx0/64 link#1 U vmx0 fe80::250:56ff:fe81:6e14%lo0 link#3 UHS lo0 fe80::%lo0/64 link#3 U lo0 fe80::1%lo0 link#3 UHS lo0 ff02::/16 link#3 URS lo0 root@test-ipv6-01:~ #
- WAN interface has local-link address fe80::250:56ff:fe81:6e14%vmx0
- Default router (Vodafone router) with local-link address fe80::ae22:5ff:fe2c:9485%vmx0 has been assigned and add it to routing table.
- WAN interface has globaly-routable address 2a02:830a:b00d:5600:250:56ff:fe81:6e14
- I can ping Vodafone router fe80::ae22:5ff:fe2c:9485%vmx0
- I can ping Google's DNS server 2001:4860:4860::8888
- I can ping Vodafone's DNS server 2a00:11b4:4110::a assigned via SLAAC
SLAAC Configuration + DHCP6
DHCP client is not required because SLAAC works correctly in Vodafone/UPC network.Static IPv6 Configuration
Static IPv6 configuration is not required because SLAAC works correctly in Vodafone/UPC network.
IPv6 Network Performance Testing
Everything must be thoroughly tested before it can be considered production-ready. Let's do some tests.
traceroute6
root@test-ipv6-01:~ #traceroute6 www.google.comtraceroute6 to www.google.com (2a00:1450:4014:80f::2004) from 2a02:830a:b00d:5600:250:56ff:fe81:6e14, 64 hops max, 28 byte packets 1 2a02:830a:b00d:5600:ae22:5ff:fe2c:9485 4.042 ms 3.326 ms 3.482 ms 2 * * * 3 2a02:8300:52::1 19.250 ms 14.334 ms 13.564 ms 4 2a02:8300::ffff:b9bc:b8aa 13.491 ms 15.313 ms 11.252 ms 5 * * * 6 2001:4860:0:1::7f3d 10.505 ms 18.152 ms 2001:4860:0:1::7eab 15.795 ms 7 2001:4860:0:1::50df 12.066 ms 15.013 ms 13.213 ms 8 prg03s13-in-x04.1e100.net 13.675 ms 13.636 ms 11.836 ms root@test-ipv6-01:~ #
ping
root@test-ipv6-01:~ #ping -c 15 www.google.comPING(56=40+8+8 bytes) 2a02:830a:b00d:5600:250:56ff:fe81:6e14 --> 2a00:1450:4014:80f::2004 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=0 hlim=119 time=13.387 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=1 hlim=119 time=12.760 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=2 hlim=119 time=7.231 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=3 hlim=119 time=7.446 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=4 hlim=119 time=7.512 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=5 hlim=119 time=7.071 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=6 hlim=119 time=6.949 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=7 hlim=119 time=7.544 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=8 hlim=119 time=7.009 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=9 hlim=119 time=8.523 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=10 hlim=119 time=7.483 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=11 hlim=119 time=6.647 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=12 hlim=119 time=7.766 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=13 hlim=119 time=6.949 ms 16 bytes from 2a00:1450:4014:80f::2004, icmp_seq=14 hlim=119 time=7.195 ms --- www.google.com ping statistics --- 15 packets transmitted, 15 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 6.647/8.098/13.387/2.000 ms root@test-ipv6-01:~ #
iperf3 (Throughput) upload test
root@test-ipv6-01:~ #iperf3 -c iperf3.moji.fr -t60 -i5Connecting to host iperf3.moji.fr, port 5201 [ 5] local 2a02:830a:b00d:5600:250:56ff:fe81:6e14 port 18574 connected to 2a06:c484:6::3:1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-5.01 sec 15.1 MBytes 25.3 Mbits/sec 131 177 KBytes [ 5] 5.01-10.01 sec 14.9 MBytes 25.0 Mbits/sec 1 196 KBytes [ 5] 10.01-15.01 sec 14.8 MBytes 24.8 Mbits/sec 8 176 KBytes [ 5] 15.01-20.01 sec 14.6 MBytes 24.6 Mbits/sec 5 178 KBytes [ 5] 20.01-25.01 sec 14.6 MBytes 24.5 Mbits/sec 1 173 KBytes [ 5] 25.01-30.00 sec 14.8 MBytes 24.8 Mbits/sec 2 163 KBytes [ 5] 30.00-35.00 sec 14.8 MBytes 24.7 Mbits/sec 2 173 KBytes [ 5] 35.00-40.01 sec 14.8 MBytes 24.7 Mbits/sec 1 171 KBytes [ 5] 40.01-45.01 sec 14.8 MBytes 24.8 Mbits/sec 3 171 KBytes [ 5] 45.01-50.01 sec 14.8 MBytes 24.7 Mbits/sec 4 166 KBytes [ 5] 50.01-55.01 sec 14.8 MBytes 24.8 Mbits/sec 5 160 KBytes [ 5] 55.01-60.00 sec 14.6 MBytes 24.6 Mbits/sec 2 156 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.00 sec 177 MBytes 24.8 Mbits/sec 165 sender [ 5] 0.00-60.04 sec 177 MBytes 24.7 Mbits/sec receiver iperf Done. root@test-ipv6-01:~ #
iperf3 (Throughput) dowload test
root@test-ipv6-01:~ #iperf3 -c iperf3.moji.fr -t60 -i5 -RConnecting to host iperf3.moji.fr, port 5201 Reverse mode, remote host iperf3.moji.fr is sending [ 5] local 2a02:830a:b00d:5600:250:56ff:fe81:6e14 port 22380 connected to 2a06:c484:6::3:1 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-5.02 sec 140 MBytes 235 Mbits/sec [ 5] 5.02-10.01 sec 147 MBytes 246 Mbits/sec [ 5] 10.01-15.02 sec 140 MBytes 234 Mbits/sec [ 5] 15.02-20.01 sec 147 MBytes 246 Mbits/sec [ 5] 20.01-25.02 sec 140 MBytes 235 Mbits/sec [ 5] 25.02-30.01 sec 147 MBytes 246 Mbits/sec [ 5] 30.01-35.02 sec 140 MBytes 235 Mbits/sec [ 5] 35.02-40.01 sec 147 MBytes 246 Mbits/sec [ 5] 40.01-45.02 sec 140 MBytes 235 Mbits/sec [ 5] 45.02-50.01 sec 147 MBytes 246 Mbits/sec [ 5] 50.01-55.02 sec 140 MBytes 235 Mbits/sec [ 5] 55.02-60.00 sec 146 MBytes 247 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-60.04 sec 1.68 GBytes 241 Mbits/sec 0 sender [ 5] 0.00-60.00 sec 1.68 GBytes 241 Mbits/sec receiver iperf Done. root@test-ipv6-01:~ #
Conclusion
In Vodafone/UPC network, globally-routed IPv6 unicast address is assigned dynamically along with local-link address.
I can achieve the expected asymmetric 240/25 Mbps throughput on both protocols versions, so network throughput works perfectly fine.
I can achieve better response time on IPv4,which is expected because IPv6 has benefits in routing efficiency (Fixed Length Header, No NAT, Built-in Hierarchical Addressing).
I'm pretty happy with IPv6 testing in Vodafone. I'm probably ready to plan switching my network from IPv4 to IPv6.
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