Query on default gateway with DHCP vs Static address

[SIMON BABY]

Hi Glenn,
It did not show the default route of 0.0.0.0/0 with route -n. One thing I
noticed is, I can ping to another Address only with -I interface_name. For
example I can send and receive packets with *ping -I eth0 8.8.8.8.*
If I use *ping 8.8.8.8 *it is not working. Am I missing anything here?

Regards
Simon

On Thu, Mar 18, 2021 at 8:15 PM <glenn.satchell at uniq.com.au> wrote:

> 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
> _______________________________________________
> 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
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>
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