[Discuss] connection issue

[John Abreau]

Good point about the DHCP. When I set up my wifi router, many years ago, I
disabled its DHCP and instead ran a DHCP server on one of my internal Linux
servers.

I configured all network clients to use DHCP, except for the router and the
DHCP server itself, and defined static addresses within the dhcp config for
devices that needed static addresses.



On Mon, Nov 21, 2022 at 12:26 AM John Hall <johnhall2.0 at gmail.com> wrote:

> agree with this idea of adding a network device but first lets get more
> details that  is just going to make things complicated.  I'd go for a
> simple switch if you add anything.
> Most access points have a place to set up static DHCP addresses in Advanced
> and most just let you choose the device that's connected and set that
> device's address. I usually change the range for the DHCP automatic
> assignments to start at like 100, then set the static addresses in the
> lower end of the range.
> Another complication can be if you have a network with both wired and
> wireless systems.
> The router must be set to bridge the wifi and the ethernet.
>
> Are any systems set to be in a DMZ at the access point?
>
> It could be a problem with routing tables not being propagated, or the net
> mask being misconfigured also usually set by dhcp.
> If you can nail down the IP addresses then you can set routes and hostnames
> manually but what it should do is get DNS from the Lan access point and
> this should contain them all. If you have /etc/resolv.conf and /etc/hosts
> configured in a certain way, this might be confusing the routing.
>
> Have you rebooted everything? (I  would presume yes but it could be
> inconvenient.)
> If it is a system configuration issue on your linux boxes is there a way a
> change in one system would be migrated to the others ?
>
> We would benefit from some tabular data rather than a dozen separate
> questions:
>
> net1, Network device1 manufacturer and model#, wifi or ethernet (if both
> list twice), number of ports or list of frequencies
> net2, Network device 2 manufacturer and model#, wifi or ethernet (if both
> list twice),number of ports or list of frequencies
> sys1, name, MAC1, IP, netmask,wifi or ethernet,  net device, port or
> band(s)
> If a system is connected to both ethernet and wifi list it twice
> sys2, name, MAC1, IP, netmask,wifi or ethernet,  net device, port or
> band(s)
>
> It's very simple but that means it would be easy to make the table and we
> don't really need macs on a first pass, or maybe just answer some of the
> questions it implies.
>
> Some commands and files to look at that might help:
> ip addr
> ping -b 192.168.0.255  # Ususully the broadcast address. #I think that is
> the right option
> or
> nmap -sP 192.168.0.1-254
> systemctl status sshd
> /etc/resolv.conf
> /etc/hosts
> firewall-command --permanent --list-all-zones
> firewall-command --list-all-zones
>
>
> On Sun, Nov 20, 2022 at 5:17 PM dan moylan <jdm at moylan.us> wrote:
>
> >
> > shankar viswanathan writes:
> > > I am not familiar with the Wifi access point that the
> > > T-Mobile service provides, but I'm taking a guess here. Did
> > > you set up these machines on a "guest" SSID network or some
> > > such setting on the AP? I have found that the default
> > > configuration in typical home routers for guest networks is
> > > to isolate clients from each other and only allow access to
> > > the WAN.  This would explain the behavior you are seeing.
> >
> > it is indeed a wireless access point connecting to their
> > cell towers.  don't really remember, but signing in as guest
> > is  not something i would have done on purpose.  the phone
> > app shows all the connections, and nowhere do i see "guest".
> >
> > btw, when i ping i see "destinantion host unreachable"
> >
> > ole dan
> >
> > j. daniel moylan
> > 84 harvard ave
> > brookline, ma 02446-6202
> > 617-777-0207 (cel old ng)
> > 857-396-9950 (cel new)
> > jdm at moylan.us
> > www.moylan.us
> > [BLM]
> > _______________________________________________
> > Discuss mailing list
> > Discuss at lists.blu.org
> > http://lists.blu.org/mailman/listinfo/discuss
> >
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-- 
John Abreau / Executive Director, Boston Linux & Unix
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