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Today's Topics:
1. Re: Query on default gateway with DHCP vs Static address
(SIMON BABY)
2. Re: Query on default gateway with DHCP vs Static address
(glenn.satch...@uniq.com.au)
3. Re: Query on default gateway with DHCP vs Static address
(SIMON BABY)
----------------------------------------------------------------------
Message: 1
Date: Thu, 18 Mar 2021 20:34:36 -0700
From: SIMON BABY <simonkb...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Query on default gateway with DHCP vs Static address
Message-ID:
<CAEFUPH3=qAzTfAGioCr4m7nutgj34-ucbjppkV5ZkN=qudj...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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.satch...@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.yard...@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 <simonkb...@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@lists.isc.org
> >>> https://lists.isc.org/mailman/listinfo/dhcp-users
> >>
> >> Peter Yardley
> >> peter.martin.yard...@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@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@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@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
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------------------------------
Message: 2
Date: Fri, 19 Mar 2021 14:48:27 +1100
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Query on default gateway with DHCP vs Static address
Message-ID: <997594f70ce2e1fd12008a72b3df6...@uniq.com.au>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Simon,
On your dhcp server do you specify a gateway? For isc dhcpd it will be
"option routers" in the subnet definition settings. Verify that the
gateway you specify is in the same subnet as the IP address being
assigned to the interface.
Can you post the output from "ip route" and "ip address" so we can see
what is there?
If you are configuring the IP address manually then it depends on your
particular version of linux on how that is done. Usually you will
specify an IP address, netmask and gateway- but the files used vary from
distribution to distribution. eg Ubuntu uses /etc/netplan/*yaml or
/etc/network/interfaces depending on the version. CentOS uses
/etc/sysconfig/network-scripts/ifcfg-eth0. Or it may use Network Manager
and the associated GUI to manage the configuration.
regards,
Glenn
On 2021-03-19 14:34, SIMON BABY wrote:
> Hi Glenn,
> It did not show the default route of 0.0.0.0/0 [1] 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.satch...@uniq.com.au> wrote:
>
>> Hi Simon,
>>
>> The default route will show up with a destination of 0.0.0.0/0 [1]
>> 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.yard...@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 <simonkb...@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@lists.isc.org
>>>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>>
>>>> Peter Yardley
>>>> peter.martin.yard...@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@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@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@lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>
>
> Links:
> ------
> [1] http://0.0.0.0/0
> _______________________________________________
> 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@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Message: 3
Date: Thu, 18 Mar 2021 22:10:09 -0700
From: SIMON BABY <simonkb...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Query on default gateway with DHCP vs Static address
Message-ID:
<caefuph1snclnvozcck+cgsutazqaw2c8cb7yedhoyha6qdo...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Glenn,
My linux interface is a DHCP client which is connected to a night
hawk (cradlepoint) which acts as the DHCP server. So my Linux interface is
getting a DHCP IP address as gievn below
eth1.15 Link encap:Ethernet HWaddr 00:08:A2:00:00:02
inet addr:*192.168.1.76 * Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:457 errors:0 dropped:0 overruns:0 frame:0
TX packets:1782 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:44717 (43.6 KiB) TX bytes:1704498 (1.6 MiB)
The kernel routing table is below. I did not see any default GW in the
routing table.
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.64.64.67 0.0.0.0 255.255.255.255 UH 0 0 0
ppp3
10.64.64.66 0.0.0.0 255.255.255.255 UH 0 0 0
ppp2
10.64.64.65 0.0.0.0 255.255.255.255 UH 0 0 0
ppp1
255.255.255.255 0.0.0.0 255.255.255.255 UH 0 0 0
eth1.13
*192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
eth1.15*
128.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0
eth1.16
128.1.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
10.20.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth1.13
Regards
Simon
On Thu, Mar 18, 2021 at 8:48 PM <glenn.satch...@uniq.com.au> wrote:
> Hi Simon,
>
> On your dhcp server do you specify a gateway? For isc dhcpd it will be
> "option routers" in the subnet definition settings. Verify that the
> gateway you specify is in the same subnet as the IP address being
> assigned to the interface.
>
> Can you post the output from "ip route" and "ip address" so we can see
> what is there?
>
> If you are configuring the IP address manually then it depends on your
> particular version of linux on how that is done. Usually you will
> specify an IP address, netmask and gateway- but the files used vary from
> distribution to distribution. eg Ubuntu uses /etc/netplan/*yaml or
> /etc/network/interfaces depending on the version. CentOS uses
> /etc/sysconfig/network-scripts/ifcfg-eth0. Or it may use Network Manager
> and the associated GUI to manage the configuration.
>
> regards,
> Glenn
>
> On 2021-03-19 14:34, SIMON BABY wrote:
> > Hi Glenn,
> > It did not show the default route of 0.0.0.0/0 [1] 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.satch...@uniq.com.au> wrote:
> >
> >> Hi Simon,
> >>
> >> The default route will show up with a destination of 0.0.0.0/0 [1]
> >> 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.yard...@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 <simonkb...@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@lists.isc.org
> >>>>> https://lists.isc.org/mailman/listinfo/dhcp-users
> >>>>
> >>>> Peter Yardley
> >>>> peter.martin.yard...@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@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@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@lists.isc.org
> >> https://lists.isc.org/mailman/listinfo/dhcp-users
> >
> >
> > Links:
> > ------
> > [1] http://0.0.0.0/0
> > _______________________________________________
> > 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@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@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
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