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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