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Today's Topics:
1. DHCPV6 - IP assignment not working (Usman Ahmad)
2. Re: Assign IP based on if giaddr is even or odd (Stephen Donovan)
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Message: 1
Date: Thu, 7 Jan 2021 21:49:30 +0400
From: Usman Ahmad <usman....@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: DHCPV6 - IP assignment not working
Message-ID:
<cale1tgrjahoqkto2-b6u-ex+udsehu1cbazovejyq_uedmm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Dear Experts,
I have configured DHCPv6 but IP assignment not working. i can see only WAN
IPv6 address however LAN delegated prefix isn't being assigned.
DHCP configuration:
shared-network site-a100 {
subnet6 20a0:b241:2:2::/64 {
pool6 {
range6 20a0:b241:0002:0002:0000:0000:0000:1000
20a0:b241:0002:0002:ffff:ffff:ffff:ffff;
range6 20a0:b241:2:2::/64 temporary;
option dhcp6.name-servers
20a0:b241:2:5::4,20a0:b241:2:5::5;
prefix6 20a0:b241:2:300:: 20a0:b241:2:400:: /64;
min-lease-time 600;
preferred-lifetime 600;
default-lease-time 600;
max-lease-time 600;
allow unknown-clients;
}
}
}
DHCP logs:
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Relay-forward message from
20a0:b241:0:2::3 port 547, link address 20a0:b241:2:2::2, peer address
fe80::2ab4:48ff:feec:3f1e
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Picking pool prefix
20a0:b241:2:400::/64
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Advertise PD: address
20a0:b241:2:400::/64 to client with duid 00:03:00:01:28:b4:48:ec:3f:1e iaid
= 0 valid for 600 seconds
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Sending Relay-reply to
20a0:b241:0:2::3 port 547
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Relay-forward message from
20a0:b241:0:2::2 port 547, link address 20a0:b241:2:2::3, peer address
fe80::2ab4:48ff:feec:3f1e
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Picking pool prefix
20a0:b241:2:400::/64
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Advertise PD: address
20a0:b241:2:400::/64 to client with duid 00:03:00:01:28:b4:48:ec:3f:1e iaid
= 0 valid for 600 seconds
Jan 7 15:42:51 dhcp64-01 dhcpd[15188]: Sending Relay-reply to
20a0:b241:0:2::2 port 547
Jan 7 15:42:52 dhcp64-01 dhcpd[15188]: Relay-forward message from
20a0:b241:0:2::3 port 547, link address 20a0:b241:2:2::2, peer address
fe80::2ab4:48ff:feec:3f1e
Jan 7 15:42:52 dhcp64-01 dhcpd[15188]: Picking pool prefix
20a0:b241:2:400::/64
Jan 7 15:42:52 dhcp64-01 dhcpd[15188]: Advertise PD: address
20a0:b241:2:400::/64 to client with duid 00:03:00:01:28:b4:48:ec:3f:1e iaid
= 0 valid for 600 seconds
Jan 7 15:42:52 dhcp64-01 dhcpd[15188]: Sending Relay-reply to
20a0:b241:0:2::3 port 547
regards,
Usman
--
*--*
*Regards,*
Usman Ahmad
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Message: 2
Date: Thu, 7 Jan 2021 17:54:43 +0000
From: Stephen Donovan <stephen.dono...@gmail.com>
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: Re: Assign IP based on if giaddr is even or odd
Message-ID:
<ch2pr14mb35629d5eaef76ee7a813bf33fe...@ch2pr14mb3562.namprd14.prod.outlook.com>
Content-Type: text/plain; charset="us-ascii"
Thanks for the responses that I received, I managed to get it working.
Here is the match statement that I needed to use finally.
match if (suffix(binary-to-ascii(2,8, ".", packet(27,1)),1) = "0");
From: Stephen Donovan <stephen.dono...@gmail.com>
Date: Wednesday, January 6, 2021 at 12:53 PM
To: "dhcp-users@lists.isc.org" <dhcp-users@lists.isc.org>
Subject: Assign IP based on if giaddr is even or odd
Hello Gurus
I am trying to deploy a series of routers that can use DHCP to provide an IP
address to the neighbouring router and once the router is reachable management
software will push configuration to it.
All links between the routers are /31 subnets and it is possible that each
router could be configured in each direction, for example if router A is up,
then it will offer an address to router B, however if router B is up before A
then B will offer an address to A.
I tried the sample subnet shown below and everything works, if I use the full
giaddr in the match statement, however if I try to simplify it to match the
class if the giaddr is even or odd doesn't work. My attempt on using a regex to
match even/odd is commented out.
Does anyone have any suggestions on how I could use a different match to hand
out different addresses based on if the giaddr is even or odd? Did I make a
fundamental mistake in my match statement. I'm willing to use the full match,
but would like to simplify if possible.
Thanks in advance
Steve
#test subnet
subnet 11.12.13.44 netmask 255.255.255.254 {
log(debug, concat ("giaddr: ", binary-to-ascii(10,8, ".", packet(27,1)))) ;
class "cw" {
#match if (binary-to-ascii(10,8, ".", packet(27,1)) ~~
#"^\d*[02468]$");
match if (binary-to-ascii(10,8, ".", packet(24,4)) =
"11.12.13.44");
}
pool
{
allow members of "cw";
range 11.12.13.45 11.12.13.45;
option routers 11.12.13.44;
option subnet-mask 255.255.255.254;
}
pool
{
deny members of "cw";
range 11.12.13.44 11.12.13.44;
option routers 11.12.13.45;
option subnet-mask 255.255.255.254;
}
}
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