Query on default gateway with DHCP vs Static address
glenn.satchell at uniq.com.au
glenn.satchell at uniq.com.au
Fri Mar 19 03:15:16 UTC 2021
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
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