Query on default gateway with DHCP vs Static address

[glenn.satchell at uniq.com.au]

Hi Simon,

The default route will show up with a destination of 0.0.0.0/0 if you 
use route -n.

If you use "ip route" it will show up with a destination of "default" in 
the first column.

regards,
Glenn

On 2021-03-19 13:54, SIMON BABY wrote:
> Hi Peter,
> Thank you so much for helping.
> 
> Yes, I am using ISC dhcpd. My query is with ISC DHCPd I can ping to
> any network, but I did not see the ISC gateway in the kernel route
> table. Will it be stored somewhere else so that when packet goes out,
> the hardware (NIC) gets this information?
> 
> Regards
> Simon
> 
> On Thu, Mar 18, 2021 at 5:07 PM Peter Yardley
> <peter.martin.yardley at gmail.com> wrote:
> 
>> Hi,
>> 
>> This is prolly a problem with your configuration. Are you using ISC
>> DHCPd? If so could provide a relevant snippet of your configuration,
>> anonymised if necessary.
>> 
>> I used to configure subnets like this …
>> 
>> subnet 10.20.50.0 netmask 255.255.254.0 {
>> option subnet-mask 255.255.254.0;
>> option broadcast-address 10.20.51.255;
>> option routers 10.20.50.1;
>> 
>> pool {
>> # A device for Blah
>> host HMTXYZ           { hardware ethernet 00:40:9d:54:4c:c7;
>> fixed-address 10.20.50.32; }
>> …
>> 
>> range 10.20.51.0 138.25.51.254;
>> }
>> 
>> Of course there are many other correct possiblities
>> 
>>> On 19 Mar 2021, at 10:03 am, SIMON BABY <simonkbaby at gmail.com>
>> wrote:
>>> 
>>> Hi,
>>> I have a query about the DHCP provided IP address vs Static IP
>> address configured manually.  When i get the IP address from DHCP, I
>> can ping to 8.8.8.8 (google public server) where as
>>> with a statically configured IP address, I could not.  When I
>> looked into the route table (route -n ), I did not see any default
>> gateway with DHCP or Statically configured IP.  (I am testing with
>> Linux).
>>> 
>>> 1. Can I know when the packet goes out , how did the hardware
>> (NIC) find the default gateway in the case of the DHCP provided IP
>> address since I did not see any default gw IP in the routing table?
>>> 2. With statically configured IP, if I explicitly configure a
>> default GW, I can see packets are going out and receiving. I can see
>> the default GW in the routing table. Do I need a default GW to send
>> packets from a statically configured IP address ?
>>> 
>>> Thank you for your time
>>> 
>>> Regards
>>> Simon
>>> 
>>> _______________________________________________
>>> ISC funds the development of this software with paid support
>> subscriptions. Contact us at https://www.isc.org/contact/ for more
>> information.
>>> 
>>> dhcp-users mailing list
>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>> 
>> Peter Yardley
>> peter.martin.yardley at gmail.com
>> 
>> _______________________________________________
>> ISC funds the development of this software with paid support
>> subscriptions. Contact us at https://www.isc.org/contact/ for more
>> information.
>> 
>> dhcp-users mailing list
>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
> 
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users