[Kea-users] How to define "code width" / "length width" on Vendor-Specific Information option (code 43)
Kotetsu kakko
kakkotetsu at gmail.com
Fri Apr 23 07:02:29 UTC 2021
Hi!
I want to convert isc-dhcp-server config below to Kea.
```
option space test_opt code width 2 length width 2 hash size 17;
option test_opt.script-url code 36 = text;
subnet 10.138.127.128 netmask 255.255.255.128 {
option routers 10.138.127.129;
option subnet-mask 255.255.255.128;
range dynamic-bootp 10.138.127.220 10.138.127.254;
vendor-option-space test_opt;
option test_opt.script-url = "http://10.138.124.42/ztp_arcos.py";
}
```
I set up Kea like below.(extract)
```
"Dhcp4": {
"option-def": [
{
"name": "test_opt_script-url",
"code": 36,
"space": "vendor-encapsulated-options-space",
"type": "string"
}
],
"subnet4": [
{
"subnet": "10.138.127.128/25",
"pools": [ { "pool": "10.138.127.220 - 10.138.127.254" } ],
"option-data": [
{
"name": "routers",
"data": "10.138.127.129"
},
{
"name": "test_opt_script-url",
"space": "vendor-encapsulated-options-space",
"data": "http://10.138.124.42/ztp_arcos.py"
},
{
"name": "vendor-encapsulated-options"
}
]
}
]
```
Kea's DHCP reply is below. It include option 43 field.
```
14:39:03.677003 IP (tos 0x0, ttl 64, id 16054, offset 0, flags [DF],
proto UDP (17), length 409)
dhcpserver.bootps > 10.138.127.131.bootps: [bad udp cksum 0x1258
-> 0x5de2!] BOOTP/DHCP, Reply, length 381, hops 1, xid 0xd991b36f,
Flags [none] (0x0000)
Your-IP 10.138.127.249
Gateway-IP 10.138.127.131
Client-Ethernet-Address b4:a9:fc:d7:7f:44 (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Offer
Subnet-Mask Option 1, length 4: 255.255.255.128
Default-Gateway Option 3, length 4: 10.138.127.129
Domain-Name-Server Option 6, length 8: 10.138.124.36,10.138.124.37
Hostname Option 12, length 9: "localhost"
Domain-Name Option 15, length 14: "local"
Vendor-Option Option 43, length 35:
36.33.104.116.116.112.58.47.47.49.48.46.49.51.56.46.49.50.52.46.52.50.47.122.116.112.95.97.114.99.111.115.46.112.121
Lease-Time Option 51, length 4: 3600
Server-ID Option 54, length 4: dhcpserver
RN Option 58, length 4: 900
RB Option 59, length 4: 1800
Client-ID Option 61, length 7: ether b4:a9:fc:d7:7f:44
T119 Option 119, length 16: 57370161,41185796,1768516201,40529920
END Option 255, length 0
```
It looks `36(code).33(Length).(data)` but DHCP client expects
`00.36(code).00.33(length).(data)`
```
Vendor-Option Option 43, length 35:
36.33.104.116.116.112.58.47.47.49.48.46.49.51.56.46.49.50.52.46.52.50.47.122.116.112.95.97.114.99.111.115.46.112.121
```
How to reply `00.36(code).00.33(length).(data)` format?
Regards.
--
kakkotetsu (kakkotetsu at gmail.com)
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