Query on default gateway with DHCP vs Static address
Peter Yardley
peter.martin.yardley at gmail.com
Fri Mar 19 00:07:30 UTC 2021
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
>
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Peter Yardley
peter.martin.yardley at gmail.com
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