Windows 7 Failing Ping on IPv6 in DHCP Setup
You can't set the router through DHCPv6 (One of the many shortcomings I've found in it). You have to use the router advertisement protocol.
You have the prefix commented out in the configuration file you posted. DHCPv6 will need that or else the client has to guess, Windows defaults to 128.
Here is a pretty simple example with all the common options for ISC DHCPv6.
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bradlis7
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Updated on September 17, 2022Comments
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bradlis7 almost 2 years
I have set up a test ISC DHCP server that is not connected to an internet with DHCP and DHCPv6. I also have a Cisco 3750G with IPv6 enabled. I have firewalls off on both machines.
My Windows 7 machine will get both an IPv4 and an IPv6 address:
Ethernet adapter Wired Network Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) 82566MM Gigabit Network Connection Physical Address. . . . . . . . . : 00-0B-97-DD-18-4E DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : 2001:6::afb(Preferred) Link-local IPv6 Address . . . . . : fe80::900c:ec5b:cfd0:8470%11(Preferred) IPv4 Address. . . . . . . . . . . : 10.99.1.101(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DHCP Server . . . . . . . . . . . : 10.99.1.10 DHCPv6 IAID . . . . . . . . . . . : 234883991 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-99-C3-BE-00-0B-97-DD-18-4E DNS Servers . . . . . . . . . . . : 2001:6::10 10.99.1.10 NetBIOS over Tcpip. . . . . . . . : Enabled
Pinging on IPv4 works fine both ways. I can ping using IPv6 from the DHCP server to my windows machine, but if I try to ping from the Windows machine, to elsewhere, it gives me this:
C:\Users\Brad>ping 2001:8::10 Pinging 2001:8::10 with 32 bytes of data: PING: transmit failed. General failure. PING: transmit failed. General failure. Ping statistics for 2001:8::10 Packets: Sent = 2, Received = 0, Lost = 2 (100% loss)
I read that I need to have a default router set (doesn't really make sense as I'm not leaving the network), but I can't find the option to set it.
option routers
expects an IPv4 address.Any ideas on what I'm doing wrong?
Edit: More Info
/etc/dhcpd6.conf
#Some defines # These made no difference, but I saw them elsewhere: #option dhcp6.softwire code 54 = ip6-address; #option dhcp6.defroute code 123 = ip6-address; #option dhcp6.defgateway code 99 = ip6-address; ping-check false; ddns-update-style none; authoritative; default-lease-time 900; min-lease-time 900; max-lease-time 900; shared-network "pool 1" { subnet6 2001:6::/64 { range6 2001:6::11 2001:6::fff; #prefix6 2001:6::1:0:0:0:0 2001:6::ffff:0:0:0:0 / 64; option dhcp6.name-servers 2001:6::10; option dhcp6.defgateway 2001:6::1; } }
Windows 7 Routing Table (It's only giving me /128 for the IPv6 address)
IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 11 266 2001:6::afb/128 On-link 33 276 fe80::/64 On-link 14 281 fe80::/64 On-link 11 266 fe80::/64 On-link 14 281 fe80::39e6:c23:1fc4:b71b/128 On-link 11 266 fe80::900c:ec5b:cfd0:8470/128 On-link 33 276 fe80::b933:ca7f:14:f58d/128 On-link 1 306 ff00::/8 On-link 33 276 ff00::/8 On-link 14 281 ff00::/8 On-link 11 266 ff00::/8 On-link =========================================================================== Persistent Routes: None
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bradlis7 almost 14 yearsWhen I put a static address, it works as long as I have a gateway set. Does anyone know what the "option routers" is for dhcpv6, or does the router itself have to advertise that in IPv6?
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Michael Steele about 12 yearsLooking at your Windows route table I see that there is no ::/0 or
2001:6::/64
defined. You will need both of these. The ::/0 route should be set through a router advertisement. The2001:6::/64
route may be manually configured or be included with your router advertisement. -
Wil Shipley about 10 yearsCould it be an ip4/ip6 precedence issue? See superuser.com/questions/433416/…
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bradlis7 almost 14 yearsPrefix is used for secondary routers, not for clients, right? Prefix hands out a full /64, so that that router can then give out addresses, instead of natting. Or am I missing something?
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bradlis7 almost 14 yearsI set up radvd on my box, since my Cisco 3750 didn't have the commands that it is supposed to. Thanks.
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Philip almost 14 yearsI'd have to dig through the source code to be sure, as the documentation is a bit short; but I believe it sends the prefix in the DHCP Offer as well.