Cannot seem to use DHCP server on a public IP subnet
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I have a subnet that matches a public IP subnet from my ISP. Issue is that I see discover messages get to the firewall (packet capture), but nothing returns.
DHCP within a public subnet does not work, but static assignment (within the client) allows internet access (so only DHCP is the issue).Here is an example of log entries for an attempt:
Jun 12 19:43:25 dhclient 79399 DHCPDISCOVER on mce0.99 to 255.255.255.255 port 67 interval 3 Jun 12 19:43:28 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_SUBNET [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: failed to allocate an IPv4 lease in the subnet 45.30.xx.xx/28, subnet-id 1, shared network (none) Jun 12 19:43:28 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_NO_POOLS [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: no pools were available for the address allocation Jun 12 19:43:28 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_CLASSES [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: Failed to allocate an IPv4 address for client with classes: ALL, VENDOR_CLASS_MSFT 5.0, UNKNOWN Jun 12 19:43:28 dhclient 79399 DHCPDISCOVER on mce0.99 to 255.255.255.255 port 67 interval 8 Jun 12 19:43:30 dhcp6c 14046 Sending Solicit Jun 12 19:43:30 dhcp6c 14046 transmit failed: Can't assign requested address Jun 12 19:43:33 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_SUBNET [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: failed to allocate an IPv4 lease in the subnet 45.30.xx.xx/28, subnet-id 1, shared network (none) Jun 12 19:43:33 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_NO_POOLS [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: no pools were available for the address allocation Jun 12 19:43:33 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_CLASSES [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: Failed to allocate an IPv4 address for client with classes: ALL, VENDOR_CLASS_MSFT 5.0, UNKNOWN Jun 12 19:43:36 dhclient 79399 DHCPDISCOVER on mce0.99 to 255.255.255.255 port 67 interval 15 Jun 12 19:43:41 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_SUBNET [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: failed to allocate an IPv4 lease in the subnet 45.30.xx.xx/28, subnet-id 1, shared network (none) Jun 12 19:43:41 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_NO_POOLS [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: no pools were available for the address allocation Jun 12 19:43:41 kea-dhcp4 45745 WARN [kea-dhcp4.alloc-engine.0x21ebff618900] ALLOC_ENGINE_V4_ALLOC_FAIL_CLASSES [hwtype=1 0c:c4:7a:yy:yy:yy], cid=[01:0c:c4:7a:yy:yy:yy], tid=0x86cf2b6f: Failed to allocate an IPv4 address for client with classes: ALL, VENDOR_CLASS_MSFT 5.0, UNKNOWNI've had it working on the same interface when the subnet was set to a local / non public subnet. 10.x.x.x
What could be causing such an issue with a configuration?
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@ebsense the log is from the KEA dhcp server (the new DHCP that will replace ISC DHCP in the future) but in the settings screenshot it looks like you using ISC DHCP.
Which one do you use?
And a /28 subnet is pretty small (14 usable IPs) so is the pool you created set accordingly?
