network_stuff:linux
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| network_stuff:linux [2023/09/19 14:21] – jotasandoku | network_stuff:linux [2024/10/06 17:17] (current) – jotasandoku | ||
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| Line 121: | Line 121: | ||
| * DHCPRequest: | * DHCPRequest: | ||
| * DHCPAck: : src: server IP ; dst: client-mac + tentative IP Address | * DHCPAck: : src: server IP ; dst: client-mac + tentative IP Address | ||
| + | ===== DHCP Options ===== | ||
| + | |||
| + | * **Default gateway (3):** Specifies the default gateway. Not used in DHCPv6. | ||
| + | * **Domain names (15):** Provides domain names for DNS resolution. | ||
| + | * **Vendor-Specific Info (43):** Used in Cisco PnP to point to the PnP server. | ||
| + | * **Subnet Mask (1):** Defines the subnet mask for the network. | ||
| + | * **IP lease time (51):** Specifies the duration of the IP address lease. | ||
| + | * **Renewal time (58):** Time when the client should renew the lease with the DHCP server. | ||
| + | * **Rebinding time (59):** Time when the client should attempt to rebind if the lease cannot be renewed. | ||
| + | * **Bootfile name (67):** Location of the boot file or script, often used in ZTP (Zero Touch Provisioning). | ||
| + | * **Relay Agent Info (82):** Adds metadata (e.g., VLAN, switch ID) to DHCP requests. Enabled by default with DHCP snooping for security. Can cause issues with non-Cisco DHCP servers. | ||
| + | * **Suboptions: | ||
| + | * **Circuit ID:** Identifies the switch port (e.g., VLAN 10, port 2). | ||
| + | * **Remote ID:** Identifies the relay agent (e.g., Switch-1). | ||
| + | |||
| + | ===== Additional Relevant Options ===== | ||
| + | |||
| + | * **DNS Servers (6):** Provides the IP addresses of DNS servers. | ||
| + | * **Router (3):** Specifies the router’s IP address for client devices. | ||
| + | * **TFTP Server (66):** Location of the TFTP server, often used for network device configurations. | ||
| + | * **NTP Servers (42):** Specifies the Network Time Protocol (NTP) server to synchronize time. | ||
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