예전에 찾아봤던 신기한 녀석의 후속글.. 이라고 해야하나?
2025.01.23 - [이론 관련/네트워크 관련] - DHCP option 82 relay
0~255 총 256개의 옵션이 존재하며 BOOTP 에서 유래하거나 DHCP에서 추가된 것들이 있는 것 같은데..
dhcp 서버 설정을 해본적이 없는것 같네.. dhcpd.conf 뒤져보면 나오려나?
RFC 1497 (BOOTP Vendor Information Extensions) vendor extensions[13]: Section 3 CodeNameLengthNotes
| 0 | Pad | 0 octets | Can be used to pad other options so that they are aligned to the word boundary; is not followed by length byte |
| 1 | Subnet mask | 4 octets | Client's subnet mask as per RFC 950. If both the subnet mask and the router option (option 3) are included, the subnet mask option must be first. |
| 2 | Time offset | 4 octets | Time offset of the client's subnet in seconds from Coordinated Universal Time (UTC). The offset is expressed as a two's complement 32-bit integer. A positive offset indicates a location east of the zero meridian and a negative offset indicates a location west of the zero meridian. |
| 3 | Router | Multiples of 4 octets | Available routers, should be listed in order of preference |
| 4 | Time server | Multiples of 4 octets | Available Time Protocol servers to synchronise with, should be listed in order of preference |
| 5 | Name server | Multiples of 4 octets | Available IEN 116 name servers, should be listed in order of preference |
| 6 | Domain name server | Multiples of 4 octets | Available DNS servers, should be listed in order of preference |
| 7 | Log server | Multiples of 4 octets | Available log servers, should be listed in order of preference |
| 8 | Cookie server | Multiples of 4 octets | Cookie in this case means "fortune cookie" or "quote of the day", a pithy or humorous anecdote often sent as part of a logon process on large computers; it has nothing to do with cookies sent by websites. |
| 9 | LPR Server | Multiples of 4 octets | A list of Line Printer Daemon protocol servers available to the client, should be listed in order of preference |
| 10 | Impress server | Multiples of 4 octets | A list of Imagen Impress servers available to the client, should be listed in order of preference |
| 11 | Resource location server | Multiples of 4 octets | A list of Resource Location Protocol servers available to the client, should be listed in order of preference |
| 12 | Host name | Minimum of 1 octet | Name of the client. The name may be qualified with the local domain name. |
| 13 | Boot file size | 2 octets | Length of the boot image in 512B blocks |
| 14 | Merit dump file | Minimum of 1 octet | Path where crash dumps should be stored |
| 15 | Domain name | Minimum of 1 octet | |
| 16 | Swap server | 4 octets | The IP address of a server where a swap service (e.g., swap over NFS) is provided for diskless workstations[14] |
| 17 | Root path | Minimum of 1 octet | The path in the remote filesystem specified by siaddr or sname that the client should mount as its root filesystem (e.g, over NFS) |
| 18 | Extensions path | Minimum of 1 octet | |
| 255 | End | 0 octets | Used to mark the end of the vendor option field |
[링크 : https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol#Options]
| This appendix contains DHCP options and BOOTP vendor extensions from RFC 2132, and includes the validation type for each option, as indicated in Table 10: DHCPv4 Options by Number , on page 23. The following sections describe the DHCP options in detail: • RFC 1497 Vendor Extensions, on page 1 |
| DHCP option 43 / 25DHCP (Dynamic Host Configuration Protocol) 에는 클라이언트가 DHCP 서버로부터 정보를 요청할 때 클라이언트에게 송신할 수 있는 많은 구성 옵션이 있습니다. 검색 도구를 사용하여 모든 DHCP 옵션을 볼 수 있습니다. DHCP 옵션은 DHCP 서버가 IP 주소와 함께 클라이언트에게 전달하는 추가적인 구성 데이터를 정의합니다. 일반적인 옵션에는 서브네트 마스크, 도메인명, 라우터 IP 주소, 도메인명 서버 IP 주소 및 정적 라우트가 포함됩니다. RFC 2132: DHCP 옵션 및 BOOTP 공급업체 확장의 정의를 기반으로 하는 표준 DHCP 옵션이 다음 표에 설명되어 있습니다. IBM Navigator FOR I의 DHCP 옵션 표시를 사용하여 사용자 지정 옵션을 구성할 수도 있습니다. |
[링크 : https://www.ibm.com/docs/ko/i/7.5.0?topic=concepts-dhcp-options-lookup]
[링크 : http://www.ktword.co.kr/test/view/view.php?no=1925]
윈도우 서버 DHCP 설정
[링크 : https://undefinedmaster.tistory.com/23] 43
linux dhcpd 설정
| host x41 { hardware ethernet 00:0a:e4:2f:66:38; fixed-address 10.0.0.201; option subnet-mask 255.255.255.0; option domain-name-servers 10.0.0.20; option domain-name "site"; option vendor-class-identifier "PXEClient"; vendor-option-space PXE; option PXE.discovery-control 7; option PXE.boot-server 15 1 10.0.0.20; option PXE.boot-menu 15 15 "Tpm for OSd 7.1"; option PXE.menu-prompt 0 "Tpm for Osd"; } |
[링크 : https://www.ibm.com/docs/en/tpmfod/7.1.1.14?topic=configuration-dhcpdconf-example]
[링크 : https://manpages.ubuntu.com/manpages/bionic/man5/dhcp-options.5.html]
[링크 : https://y7712.tistory.com/entry/Ubuntu-DHCP]
dhcp 옵션에서 1번이 subnet 3번이 router 인데 아래 옵션이 그 옵션인가?
| default-lease-time 600; max-lease-time 7200; subnet 10.0.0.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option routers 10.0.0.1; range 10.0.0.5 10.0.0.15; } subnet 172.16.0.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option routers 172.16.0.1; range 172.16.0.5 172.16.0.15; } |
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