[mdlug] Static IP behind NAT with Xfinity
R KANNAN
rk111810 at gmail.com
Wed Aug 5 08:01:32 EDT 2020
Thanks. I did follow the instructions but as I said in my previous email, I
do not see static IP being set in the */etc/network/interfaces *file. There
is no reference to eth0 at all in the file. Only the loop back.
If I can figure out where the static IP is set I can change it to
10.0.0.0/24 address and all should be well but I am still unable to find
the place it is getting set to 192.168.1.90 I would rather take this route
than change the router configuration between the two options.
On Tue, Aug 4, 2020 at 10:43 PM Carl T. Miller <carl at carltm.com> wrote:
> Incidentally, here is a guide for how to configure
> the IP address on Ubuntu 16.04.
>
> https://graspingtech.com/ubuntu-server-16-04-static-ip/
>
> c
>
>
> On 8/4/20 10:39 PM, Carl T. Miller wrote:
> > Okay, there are two (rather) easy ways to take care of this.
> >
> > One is set the router to use 192.168.1.0/24 instead of
> > 10.0.0.0/23. This has the advantage of not needing to
> > do anything to any devices on your network.
> >
> > The other is to give the server an address in the 10.0.0.0
> > subnet. This can be done by enabling DHCP on the
> > server and jotting down the IP address, network mask,
> > gateway and nameservers. You could either keep that
> > address or select a specific one and hard code it. The
> > main advantage here is that if/when the router needs
> > to be replaced you won't have to make any changes.
> >
> > Are your MythTV clients all getting IPs from the router?
> > If so, I'd suggest going with the second approach.
> >
> > c
> >
> >
> > On 8/4/20 10:27 PM, R Kannan wrote:
> >> Thanks for the help.
> >>
> >> I believe I had set the static IP because I am using my desktop as a
> >> MythTV master backend and I did not want the IP to jump around a few
> >> years back.
> >>
> >> Now for the life of me I cannot figure out where I had set the static
> >> IP to be 192.168.1.90 (which is in the range of my old router). My
> >> new router seems to be using 10.0.0.2 through 10.1.1.255. So I
> >> believe I have to keep the static IP in this range
> >>
> >> ifconfig says...
> >>
> >> eth0 Link encap:Ethernet HWaddr 38:60:77:c7:57:34
> >> inet addr:192.168.1.90 Bcast:192.168.1.255 Mask:255.255.255.0
> >> inet6 addr: fe80::3a60:77ff:fec7:5734/64 Scope:Link
> >> inet6 addr: 2600:1702:28b0:d290:3a60:77ff:fec7:5734/64
> >> Scope:Global
> >> inet6 addr: 2600:1702:28b0:d290::447/128 Scope:Global
> >> inet6 addr: 2600:1702:28b0:d290:d45e:1460:3561:f3df/64
> >> Scope:Global
> >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> RX packets:458563 errors:0 dropped:54217 overruns:0 frame:0
> >> TX packets:247011 errors:0 dropped:0 overruns:0 carrier:0
> >> collisions:0 txqueuelen:1000
> >> RX bytes:471035045 (471.0 MB) TX bytes:50199927 (50.1 MB)
> >>
> >> lo Link encap:Local Loopback
> >> inet addr:127.0.0.1 Mask:255.0.0.0
> >> inet6 addr: ::1/128 Scope:Host
> >> UP LOOPBACK RUNNING MTU:65536 Metric:1
> >> RX packets:163310 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:163310 errors:0 dropped:0 overruns:0 carrier:0
> >> collisions:0 txqueuelen:0
> >> RX bytes:11274718 (11.2 MB) TX bytes:11274718 (11.2 MB)
> >>
> >> These are the contents of the file /etc/network/interfaces (no
> >> mention of eth0). Not sure where the static address is set.
> >>
> >> eth0 Link encap:Ethernet HWaddr 38:60:77:c7:57:34
> >> inet addr:192.168.1.90 Bcast:192.168.1.255 Mask:255.255.255.0
> >> inet6 addr: fe80::3a60:77ff:fec7:5734/64 Scope:Link
> >> inet6 addr: 2600:1702:28b0:d290:3a60:77ff:fec7:5734/64
> >> Scope:Global
> >> inet6 addr: 2600:1702:28b0:d290::447/128 Scope:Global
> >> inet6 addr: 2600:1702:28b0:d290:d45e:1460:3561:f3df/64
> >> Scope:Global
> >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> RX packets:458563 errors:0 dropped:54217 overruns:0 frame:0
> >> TX packets:247011 errors:0 dropped:0 overruns:0 carrier:0
> >> collisions:0 txqueuelen:1000
> >> RX bytes:471035045 (471.0 MB) TX bytes:50199927 (50.1 MB)
> >>
> >> lo Link encap:Local Loopback
> >> inet addr:127.0.0.1 Mask:255.0.0.0
> >> inet6 addr: ::1/128 Scope:Host
> >> UP LOOPBACK RUNNING MTU:65536 Metric:1
> >> RX packets:163310 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:163310 errors:0 dropped:0 overruns:0 carrier:0
> >> collisions:0 txqueuelen:0
> >> RX bytes:11274718 (11.2 MB) TX bytes:11274718 (11.2 MB)
> >>
> >>
> >>
> >> On 8/4/20 8:29 PM, Carl T. Miller wrote:
> >>> Did you know you could assign more than one IP address
> >>> to an interface? If you can set the Ubuntu desktop to use
> >>> DHCP, it will get you on your local lan and the internet.
> >>> Then you can just add a static IP address.
> >>>
> >>> If this sounds good, start by getting the desktop to use
> >>> DHCP and ensure that it's able to connect to your lan
> >>> and the internet. We can figure out how to add the
> >>> static one afterwards.
> >>>
> >>> c
> >>>
> >>>
> >>> On 8/4/20 7:49 PM, R Kannan wrote:
> >>>> Hello,
> >>>>
> >>>> I just subscribed to comcast (did not have many choices
> >>>> unfortunately) and got their modem/router (Voice and Data Modem
> >>>> ARRIS Group, Inc. TG1682G). Their dumbed down setup web application
> >>>> seemed to work. The wireless is fine and the wired works with
> >>>> devices using DHCP.
> >>>>
> >>>> But I have a desktop running ubuntu 16.04 using a static IP (for
> >>>> various reasons) and when I connected it to the comcast router it
> >>>> did not seem to have any connection. Is there something special I
> >>>> need to do for devices not requiring IP or the subnet incorrect. I
> >>>> cannot find what subnet addresses are being doled out by the router
> >>>> as there is no simple web interface like in other modems.
> >>>>
> >>>> I thought I will ask here before I go up the chain of Comcast
> >>>> unhelpful masses.
> >>>>
> >>>> Any help is appreciated.
> >>>>
> >>>> Thanks
> >>>>
> >>>> _______________________________________________
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> >>>
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> >>
> >
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