[mdlug] Static IP behind NAT with Xfinity
Carl T. Miller
carl at carltm.com
Tue Aug 4 22:43:39 EDT 2020
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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>>>> mdlug at mdlug.org
>>>> http://mdlug.org/mailman/listinfo/mdlug
>>>
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>
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