On 08/18/18 17:24, Jonathan Ryshpan wrote: > I had thought that the DHCP communication tells computers attached to the > router > how to set up their routing, /etc/resolv.conf, etc. Maybe not.
Yes, it does. This is a typical DHCP response.... As you can see, it tells the client the IP address, subnet mask, broadcast address, DNS server, and Default router. Frame 8505: 345 bytes on wire (2760 bits), 345 bytes captured (2760 bits) on interface 0 Ethernet II, Src: Synology_76:13:a8 (00:11:32:76:13:a8), Dst: PcsCompu_d7:8c:f0 (08:00:27:d7:8c:f0) Internet Protocol Version 4, Src: 192.168.1.1, Dst: 192.168.1.80 User Datagram Protocol, Src Port: 67, Dst Port: 68 Bootstrap Protocol (ACK) Message type: Boot Reply (2) Hardware type: Ethernet (0x01) Hardware address length: 6 Hops: 0 Transaction ID: 0xb06cb07f Seconds elapsed: 0 Bootp flags: 0x0000 (Unicast) 0... .... .... .... = Broadcast flag: Unicast .000 0000 0000 0000 = Reserved flags: 0x0000 Client IP address: 0.0.0.0 Your (client) IP address: 192.168.1.80 Next server IP address: 192.168.1.1 Relay agent IP address: 0.0.0.0 Client MAC address: PcsCompu_d7:8c:f0 (08:00:27:d7:8c:f0) Client hardware address padding: 00000000000000000000 Server host name not given Boot file name not given Magic cookie: DHCP Option: (53) DHCP Message Type (ACK) Length: 1 DHCP: ACK (5) Option: (54) DHCP Server Identifier Length: 4 DHCP Server Identifier: 192.168.1.1 Option: (51) IP Address Lease Time Length: 4 IP Address Lease Time: (86400s) 1 day Option: (58) Renewal Time Value Length: 4 Renewal Time Value: (43200s) 12 hours Option: (59) Rebinding Time Value Length: 4 Rebinding Time Value: (75600s) 21 hours Option: (1) Subnet Mask Length: 4 Subnet Mask: 255.255.255.0 Option: (28) Broadcast Address Length: 4 Broadcast Address: 192.168.1.255 Option: (12) Host Name Length: 7 Host Name: f28k-b1 Option: (252) Private/Proxy autodiscovery Length: 0 Value: <MISSING> Private/Proxy autodiscovery: [Empty] Option: (6) Domain Name Server Length: 4 Domain Name Server: 192.168.1.1 Option: (3) Router Length: 4 Router: 192.168.1.1 Option: (255) End Option End: 255 -- Conjecture is just a conclusion based on incomplete information. It isn't a fact.
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