Hi,
Also you have to define if the reservations are in the pool or outside the pool.
I use a script to convert my reservations for each pool. My ISC-DHCP config is
split into multiple files, so I search all files for Reservations in this
subnet.
#!/bin/bash
# Usage: ./isc_to_kea.sh <ip-filter> <file1> [file2 ...]
# bash /usr/local/bin/isc_to_kea_ip.sh 10.102 $(find /etc/dhcpd/ -type f)
FILTER_IP="$1"
shift
echo "["
first=1
for file in "$@"; do
# Nur reguläre Dateien verarbeiten
[ -f "$file" ] || continue
awk -v ip="$FILTER_IP" '
BEGIN { block=""; inside=0 }
{
if ($0 ~ /^[[:space:]]*host[[:space:]]+[^{]+[[:space:]]*{[[:space:]]*$/) {
block = $0 "\n"
inside = 1
} else if (inside) {
block = block $0 "\n"
if ($0 ~ /^[[:space:]]*}[[:space:]]*$/) {
inside = 0
if (block ~ "fixed-address[[:space:]]+" ip) {
match(block, /host[[:space:]]+([^[:space:]]+)[[:space:]]*{/, m)
hostname = m[1]
match(block, /fixed-address[[:space:]]+([^;]+);/, m)
ipaddr = m[1]
match(block, /hardware ethernet[[:space:]]+([^;]+);/, m)
hwaddr = m[1]
match(block, /ddns-hostname[[:space:]]+"([^"]+)";/, m)
ddns = m[1]
if (!first) print ","
first = 0
print " {"
print " \"hostname\": \"" hostname "\","
print " \"ip-address\": \"" ipaddr "\","
print " \"hw-address\": \"" hwaddr "\","
print " \"ddns-hostname\": \"" ddns "\","
print " \"boot-file-name\": \"\","
print " \"client-classes\": [],"
print " \"next-server\": \"0.0.0.0\","
print " \"option-data\": [],"
print " \"server-hostname\": \"\""
print " }"
}
block = ""
}
}
}' "$file"
done
echo "]"
-----Ursprüngliche Nachricht-----
Von: Kea-users <[email protected]> Im Auftrag von Francis Dupont
Gesendet: Donnerstag, 17. Juli 2025 09:47
An: Kea user's list <[email protected]>; Mike Lieberman
<[email protected]>
Betreff: Re: [Kea-users] Problems moving from ISC-DHCP to Kea
HINWEIS: Externer Absender
Mike Lieberman writes:
> I have been using ISC-DHCP for years. I am a complete novice with Kea.
>
> I installed Kea 3.0.0 in a Debian 12 server. I migrated my large
> dhcp.conf via the ISC migration tool (successfully) and install the
> kea-dhcp4.conf file in the /etc/kea folder.
>
> I did run kea-admin -n with kea-dhcp4.conf and it took it. Testing
> showed that the service was live via dhcpdump.=C2=A0
>
> But the kea server is not serving up the reservation IP addresses that
> were migrated.
=> reservations are very different between ISC DHCP and Kea:
- ISC DHCP reservations are not attached to a particular subnet (the subnet
is found using the address when it exists)
- Kea reservations are per subnet
Two additional details:
- Kea has "global" reservations but they should not have an address even
recent Kea versions try to find the corresponding subnet
- an address can belongs to more than one subnet in Kea The result is the
translation tool can't handle corner cases with reservations...
Regards
Francis Dupont <[email protected]>
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