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Re: [K12OSN] K12OSN Digest, Vol 74, Issue 3



Since you took your w54g out ...

you previously probably had a 192.168.x.x network behind the w54g
you probably also had set you default gateway to point to the w54g's address (usually 192.168.1.1)
the w54g probably already had your ISP (roadrunner, verizon whoever), DNS and DHCP server addresses

If you hook all of that directly to your modem... you have to remember that as far as Cable Modem's go your Cable MSO usually only gives you 1 or 2 IP addresses and the cable modem gets 1.
Usually that IP address gets assigned to the WAN side of your w54g and you NAT behind the 54g to get your 192.168.x.x addresses and your DHCP gets IP addresses allocated by the w54g.

Have you checked whether you can even get an IP address from DHCP?   Also a cable modem is not a router a w54g is.   so if your ISP (Cable MSO) has say a 65.x.x.x net and
your server is using a 192.168.x.x then they won't talk w/out a router to route between the two networks.

Brian



On Mon, Apr 5, 2010 at 12:00 PM, <k12osn-request redhat com> wrote:
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Today's Topics:

  1. Re: cable connection - direct to server (Julius Szelagiewicz)
  2. Re: cable connection - direct to server (Barry Cisna)
  3. Re: cable connection - direct to server (Sergio Chaves)


----------------------------------------------------------------------

Message: 1
Date: Sun, 4 Apr 2010 18:52:08 -0400 (EDT)
From: "Julius Szelagiewicz" <julius turtle com>
To: "Support list for open source software in schools."
       <k12osn redhat com>
Subject: Re: [K12OSN] cable connection - direct to server
Message-ID:
       <45733 216 216 171 238 1270421528 squirrel 216 216 171 238>
Content-Type: text/plain;charset=iso-8859-1

> Hello All,
>
> Trying to cut down,,,again!!,on wiring,plug-ins,etc.
> I wanted to take away the linksys wr54g? router so I could just plug the
> k12ltsp server directly into my sb5120 modem. I have done this in the
> past but was quite some time ago. After getting everything redirected in
> regards to wires,and power cycling the modem(left coax/power
> disconnected for 5 mins),the server would not pull an public ip via
> dhcp. Tried crossover cable even,,no joy. I even tried my trusty Asus
> Netbook with FC10/k12linux,and it would not get an ip address either. As
> soon as I plug the linksys back into modem,it gets the (new) public
> ip,and of course then the k12ltsp server gets the internal ip ,no probs.
> Also rebooting the netbook into windows and plugging into modem it would
> get an ip no probs. I did call the cable company to ask if there was a
> known problem with possibly MTU size or something,quirky,but of course
> no one had any insight. I do not have an extra modem to try to see if
> possibly it is a firmware issue as I have read that cable companies do
> push out firmwares for modems on their networks(This is my own modem).
> Is this legal?...:)
> I did do the arp clear thing on each machine,and in fact a couple times
> when doing a service network restart got a seg fault on the ifup-eth
> script.Ive never seen this happen before. Also the network gui after the
> nic times out throws a strange error saying "i.p.a.d sent 4 packets lost
> 4 packets 100% loss".It is a class C network ip address it is trying to
> ping? never seen that before,either.
> Any ideas?
> Sorry for long post.
>
> Barry
>
Barry,
 can you change the MAC of your ethernet port? It worked for me like magic
with Cablevision.

julius



------------------------------

Message: 2
Date: Sun, 04 Apr 2010 20:24:41 -0500
From: Barry  Cisna <brcisna eazylivin net>
To: K12LTSP <k12osn redhat com>
Subject: Re: [K12OSN] cable connection - direct to server
Message-ID: <1270430681 29846 15 camel localhost localdomain>
Content-Type: text/plain

julius,

thanks much for the mac change idea it makes sense,, but i can connect
two different winders laptops no probs,,with different macs to the
sb5120 cable modem directly no probs and they obtain the correct info
from the cable co.
i did find an old post in regards to someone get IGMP request/multicast
errors in the sb5120 modem/logs,,,which mine had as well.
i reset the linux firewall to max to block icmp/igmp (i think) but still
the k12ltsp machine threw errors,pinging from 192.168.1.1 to
192.168.1.100,,it may be a diff ip the next time as well?

about a month ago this cable co run new fiber and upped the throughput.
i am going to call them and try and talk to one gentleman that seems
very knowledgeable on what is going on there,,hopefully,,:-).

Sidenote: Some time back I built an k12ltsp server for my neighbor for
his kids to run off of. I experienced the very same behavior as he has
the same sb5120 modem/same cable co,,and his server really struggles to
get an ip as it was plugged directly into the sb5120 but would
eventually get an ip address.it may take one two days,say after the
power went out for example. very odd,,,huh.

barry






------------------------------

Message: 3
Date: Mon, 5 Apr 2010 10:39:49 -0400
From: Sergio Chaves <sergio chaves gmail com>
To: "Support list for open source software in schools."
       <k12osn redhat com>
Subject: Re: [K12OSN] cable connection - direct to server
Message-ID: <201004051039 49411 sergio chaves gmail com>
Content-Type: Text/Plain;  charset="iso-8859-1"

Here in "Comcastland", I had to clone the MAC address from the registered
device to my router and "voila", all is well.


On Sunday 04 April 2010 09:24:41 pm Barry Cisna wrote:
> julius,
>
> thanks much for the mac change idea it makes sense,, but i can connect
> two different winders laptops no probs,,with different macs to the
> sb5120 cable modem directly no probs and they obtain the correct info
> from the cable co.
> i did find an old post in regards to someone get IGMP request/multicast
> errors in the sb5120 modem/logs,,,which mine had as well.
> i reset the linux firewall to max to block icmp/igmp (i think) but still
> the k12ltsp machine threw errors,pinging from 192.168.1.1 to
> 192.168.1.100,,it may be a diff ip the next time as well?
>
> about a month ago this cable co run new fiber and upped the throughput.
> i am going to call them and try and talk to one gentleman that seems
> very knowledgeable on what is going on there,,hopefully,,:-).
>
> Sidenote: Some time back I built an k12ltsp server for my neighbor for
> his kids to run off of. I experienced the very same behavior as he has
> the same sb5120 modem/same cable co,,and his server really struggles to
> get an ip as it was plugged directly into the sb5120 but would
> eventually get an ip address.it may take one two days,say after the
> power went out for example. very odd,,,huh.
>
> barry
>
>
>
>
> _______________________________________________
> K12OSN mailing list
> K12OSN redhat com
> https://www.redhat.com/mailman/listinfo/k12osn
> For more info see <http://www.k12os.org>



------------------------------

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End of K12OSN Digest, Vol 74, Issue 3
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