We are using StrongSwan on Android to connect to a StrongSwan VPN server. We
use Kea with a MySQL backend to store the DHCP host reservations (so clients
consistently get the same IP address). On iOS we're able to send a unique ID to
Kea as an option (12) in the DHCPDISCOVER message so it can consistently assign
the same IP. However, for Android clients they are missing this option in the
discover message so Kea cannot find a host reservation and picks the next
available IP from the pool. Does anyone have any suggestions for how we can
pass the same/similar unique ID from Android/StrongSwan to that Kea will be
able to identify?
Some relevant logs:
Android:
... DHCPDISCOVER (type 1) received from <ip-removed> to <ip-removed> on
interface eno2
2019-02-17 06:27:25.806 DEBUG [kea-dhcp4.packets/30134] DHCP4_QUERY_DATA
[hwtype=1 7a:a7:cf:ab:b3:4b], cid=[removed], tid=0x7d516292, packet details:
local_address=removed:67, remote_address=removed:68, msg_type=DHCPDISCOVER (1),
transid=0x7d516292,
options:
type=053, len=001: 1 (uint8)
type=055, len=002: 6(uint8) 44(uint8)
type=061, len=049: removed
2019-02-17 06:27:25.806 DEBUG [kea-dhcp4.dhcpsrv/30134]
DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet removed/32 for packet received by
matching address removed
2019-02-17 06:27:25.806 DEBUG [kea-dhcp4.packets/30134] DHCP4_SUBNET_SELECTED
[hwtype=1 7a:a7:cf:ab:b3:4b], cid=[removed], tid=0x7d516292: the subnet with ID
1 was selected for client assignments
2019-02-17 06:27:25.806 DEBUG [kea-dhcp4.packets/30134] DHCP4_SUBNET_DATA
[hwtype=1 7a:a7:cf:ab:b3:4b], cid=[removed], tid=0x7d516292: the selected
subnet details: removed/32
First few iOS Kea logs:
... DHCPDISCOVER (type 1) received from remove to removed on interface eno2
2019-02-16 03:09:10.424 DEBUG [kea-dhcp4.packets/30134] DHCP4_QUERY_DATA
[hwtype=1 7a:a7:b0:aa:50:19], cid=[removed], tid=0x8739c9aa, packet details:
local_address=removed:67, remote_address=removed:68, msg_type=DHCPDISCOVER (1),
transid=0x8739c9aa,
options:
type=012, len=036: "removed - but this is the string we want" (string)
type=053, len=001: 1 (uint8)
type=055, len=002: 6(uint8) 44(uint8)
type=061, len=removed
2019-02-16 03:09:10.424 DEBUG [kea-dhcp4.dhcpsrv/30134]
DHCPSRV_CFGMGR_SUBNET4_ADDR selected subnet removed/32 for packet received by
matching address removed
2019-02-16 03:09:10.424 DEBUG [kea-dhcp4.packets/30134] DHCP4_SUBNET_SELECTED
[hwtype=1 7a:a7:b0:aa:50:19], cid=[removed], tid=0x8739c9aa: the subnet with ID
1 was selected for client assignments
2019-02-16 03:09:10.424 DEBUG [kea-dhcp4.packets/30134] DHCP4_SUBNET_DATA
[hwtype=1 7a:a7:b0:aa:50:19], cid=[removed], tid=0x8739c9aa: the selected
subnet details: removed/32
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