Greetings,
I work for an ISP and we are considering moving away from our current DHCP
solution to ISC-DHCP or to KEA.
We would prefer to use KEA as the old ISC-DHCP will be EOL at some point.
I am having issues with my config. We have many vlans, each with multiple
subnets on them that need to be able to relay DHCP requests to KEA. I have
tried this with Kea version 1.6.2 and with the new 1.7 verision
"shared-networks": [{
"name": "VLAN4067",
"relay": {
# This relay address is inherited by both subnets.
"ip-addresses": [ "192.168.28.1" ]
},
"subnet4": [
{
"pools": [ { "pool": "192.168.28.2 - 192.168.28.2" } ],
"subnet": "192.168.28.0/30",
"option-data": [
{
"name": "routers",
"data": "192.168.28.1"
}
]
},
{
"pools": [ { "pool": "192.168.28.10 - 192.168.28.14" } ],
"subnet": "192.168.28.8/29",
"option-data": [
{
"name": "routers",
"data": "192.168.28.9"
}
]
},
{
"pools": [ { "pool": "192.168.28.18 - 192.168.28.30" } ],
"subnet": "192.168.28.16/28",
"option-data": [
{
"name": "routers",
"data": "192.168.28.17"
}
]
}]
},
{
"name": "VLAN4068",
"relay": {
# This relay address is inherited by both subnets.
"ip-addresses": [ "192.168.28.5" ]
},
"subnet4": [
{
"pools": [ { "pool": "192.168.28.6 - 192.168.28.6" } ],
"subnet": "192.168.28.4/30",
"option-data": [
{
"name": "routers",
"data": "192.168.28.5"
}
]
}]
}],
I have tried many different variations of the above config and each produces a
different error message/issue.
With this version it will hand out IP addresses from the first
subnet4/192.168.28.1 relay IP but it will not hand out an IP from the
192.168.28.5 relay IP.
When I relay the requests from 192.168.28.5 I just get this in my DHCP log.
"Failed to allocate an IPv4 address for client with classes"
For those not familiar with having multiple subnets on a VLAN it looks like
this.
!
interface Vlan4067
description "Test DHCP FCW"
bandwidth 10000000
ip dhcp relay information trusted
ip address 192.168.28.1 255.255.255.252 secondary
ip address 192.168.28.5 255.255.255.252
ip helper-address 192.168.22.234
arp timeout 300
end
I also tried this config for kea.
"shared-networks": [{
"name": "VLAN4067",
"relay": {
"ip-addresses": [ "192.168.28.1" ]
},
"subnet4": [
{
"pools": [ { "pool": "192.168.28.2 - 192.168.2" } ],
"subnet": "192.168.28.0/30",
"option-data": [
{
"name": "routers",
"data": "192.168.28.1"
}
]
},
{
"pools": [ { "pool": "192.168.10 - 192.168.28.14" } ],
"subnet": "192.168.28.8/29",
"option-data": [
{
"name": "routers",
"data": "192.168.28.9"
}
]
},
{
"pools": [ { "pool": "192.168.28.18 - 192.168.28.30" } ],
"subnet": "192.168.28.16/28",
"option-data": [
{
"name": "routers",
"data": "192.168.28.17"
}
]
}]
}],
"shared-networks": [{
"name": "test",
"relay": {
"ip-addresses": [ "192.168.28.5" ]
},
"subnet4": [
{
"pools": [ { "pool": "192.168.6 - 192.168.28.6" } ],
"subnet": "192.168.28.4/30",
"option-data": [
{
"name": "routers",
"data": "192.168.28.5"
}
]
}]
}],
With this config I get this error in my kea log.
"DHCP4_PACKET_NAK_0001 [hwtype=1 cc:be:59:XX:XX:XXX], cid=[no info],
tid=0x3f0630e4: failed to select a subnet for incoming packet, src
192.168.28.1, type DHCPDISCOVER"
If have tried many different configs and so far I can't get the multiple shared
networks to differentiate between each other based on relay IP.
Has anyone set up a network along these lines before that would be willing to
give me some pointers?
Sincerely,
<https://www.hbci.com/>
Friedrich Weissing
Network Analyst
Email: fweiss...@exchange.hbci.com
Phone: (507)474-5830
www.hbci.com<https://www.hbci.com/> | (888) 474-9995
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