routing/DNS

[Kevin E. Glosser]

Losing sync has nothing to do with a cable modem router.

It is also something that rarely occurs anymore. The newer modems are
much better at holding it. When it happens to me now, its usually for a
few seconds at most.

I've never found a good source for a technical explanation of cable
modems. I've never searched hard for one either, but I'm sure it would
be an interesting read. If anyone comes across one, please post it. :)

Hi Carl! 

KEG

-----Original Message-----
From: owner-nflug at nflug.org [mailto:owner-nflug at nflug.org] On Behalf Of
vlok stone
Sent: Friday, January 25, 2002 2:49 PM
To: nflug at nflug.org
Subject: RE: routing/DNS


the problem with losing sync may be due to the fact
that all of these cable/dsl routers use RIP
Extended IP access list no-netbios
    deny udp any eq bootps any (776 matches)
    deny tcp any any eq 137
    deny udp any any eq netbios-ns (55302 matches)
    deny tcp any any eq 138
    deny udp any any eq netbios-dgm (22688 matches)
    deny tcp any any eq 139 (8 matches)
    deny udp any any eq netbios-ss
    deny udp any any eq rip
    deny udp any any eq 121      

adel may see the keep alives as rip packets and 
drop them   or if the deny WAN request under the
advanced tab is checked it may see the address as 
being unused and throw it back in the pool. 


I'm not using a router and never get dropped
         
--- "Kevin E. Glosser" <keg at adelphia.net> wrote:
> Over 4 years ago when I first got my Adelphia cable
> modem, one of their
> technical support people told me the following...
> 
> Cable modems need to stay in sync to transfer data
> between Adelphia and
> your modem. This is called "block sync". Sometimes,
> cable modems lose
> sync and when it does nothing goes through.
> 
> The older cable modems, like the original one I had
> was terrible at
> holding "block sync". The newer ones are much better
> at it. In part due
> to a standard that was developed.
> 
> My original cable modem had a block sync indicator
> led. When it flashed,
> it was game over. No traffic went in or out. It
> would always regain
> sync, but sometimes it was a long wait.
> 
> I don't claim to know anything on how cable modems
> work, but I can
> believe this. You are simulating a LAN over cable
> wiring, there has to
> be some downside. Personally, I think it's amazing
> it works as well as
> it does. My transfer rates have increased over the
> years. Well, they did
> cap the upload rate though, sigh.
> 
> I second the thought on Adelphia getting some
> competition. Maybe then
> their tech support would be useful.
> 
> KEG
> 
> -----Original Message-----
> From: owner-nflug at nflug.org
> [mailto:owner-nflug at nflug.org] On Behalf Of
> JJ Neff
> Sent: Wednesday, January 23, 2002 5:18 PM
> To: nflug at nflug.org
> Subject: RE:routing/DNS
> 
> 
> I also have Adelphia cable and a Linksys router and
> I have a Private
> Class C Natted behind the router.  I never notice
> 24.48 inside the
> Linksys so I cant say anythign there, BUT I do ahve
> to unplug and plug
> in my Cable Modem al the time ti kick it awake
> apparently (SHEESH I WISH
> Adelphia had competition in
> Buffalo!!!!)
> 


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