Re: 7845i keeps dropping IP connection

[Jim <alarminex@xxxxxxx>]

On Oct 25, 10:31=A0am, "petem" <petem...@xxxxxxxxx> wrote:
> "Jim" <alarmi...@xxxxxxx> a =E9crit dans le message de groupe de discussi=
on :
> 972e3ad2-f6ca-4a03-b6f3-2cf474724...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
>
>
>
> > On Oct 22, 9:53 pm, "Petem" <petem...@xxxxxxxxx> wrote:
> >> "Jim" =A0a =E9crit dans le message de groupe de discussion :
> >> d930cf88-047c-4940-9511-e53277a46...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> >> > Sometimes you'll find that there's just "something" about a particul=
ar
> >> > router that doesn't jive with something on YOUR network but will wor=
k
> >> > without a hitch on another network with different components. =A0 =
=A0Go
> >> > figure!
>
> >> Totally true, had once a big argument with a network specialist...or
> >> so...
> >> telling him that his 3com switch had a non compatible auto negociate w=
ith
> >> my
> >> DVR so I could not connect it directly to his switch, the only way to
> >> make
> >> it work was if I used a small switch (d-link 4 port) between the dvr a=
nd
> >> 3com switch.
>
> >> the dvr was setup to 100mb full duplex and the switch was allways
> >> detecting
> >> the dvr as 10mb full duplex.. damn it was hell to make him understand
> >> that
> >> autonegociate doesnt allways work..after 3 days of email and visit on
> >> site
> >> (he didnt want the dlink switch to stay there) he finally reprogram th=
e
> >> port
> >> on the switch to be fix at 100mb full duplex..all was well after that.=
.
>
> >> One other time a customer was using a small network ionterface from ds=
c
> >> to
> >> do local =A0and outside download for a pc4020 and dsl3 for user..
>
> >> the customer was complaining that he was not able to connect to the
> >> device
> >> during the day.. just at night..
> >> That was very strange.. On site I pluged my laptop and started sniffin=
g
> >> the
> >> packet on the network cable that was going to the device..there was ab=
out
> >> 30mb/s of broadcast packet going to every computer on the
> >> network(broadcast
> >> packet are data sent to all device on a network...) But the catch was
> >> that
> >> the device was a 10mb/s half duplex old thing.. try to send 30,b/s to =
a
> >> 10mb/s device you will overload it and you wont be able to communicate
> >> with
> >> it..
> >> The network guys told me that it was impossible to have that much
> >> broadcast
> >> on there network. so I made them download ethereal (now wireshark) and
> >> they
> >> were not knowledgable enough to understand what there were looking at.=
.
>
> >> I had to bring from the shop a laptop I used to debug real nasty probl=
em
> >> on
> >> network that had computer associate port sniffer ( A damn good program
> >> but a
> >> bit pricey) then with a pie chart diagram of the packet received on th=
at
> >> computer for 10 minute they did understood the obvious..
>
> >> Know what was all this broadcast stuff.. Radio station.. 5 or 6 people
> >> were
> >> listening to some radio station over the internet..all different one.
> >> Usely
> >> it should not have created any problem. But here there proxy server fo=
r
> >> the
> >> network were converting Unicast packets to broadcast packets...(Unicas=
t
> >> is a
> >> way to send only one packets over internet and have it restransmit to
> >> every
> >> one at once that ask for it..so radio station dont have to send there
> >> data
> >> to 30000 pople at once (think of the bandwith needed for that!!!)
>
> >> So networking is a strange world.. anything and the inverse can happen
> >> and
> >> you need some really good alarm tech to understand it..
>
> > Sounds like you get into it a lot deeper than I do.
>
> > I'm more of a trial and error trouble shooter and if I can't figure it
> > out, call the manufacturer tech line. Only do residential and small
> > business simple network setups. Router, maybe a switch or two, a few
> > computers. I've networked a couple of home automation/whole house
> > audio/video systems. =A0Always setting up from scratch so there's not
> > much trouble shooting to do. Most of what I do works the first time so
> > I must be doing something right.
>
> Like most people do..
>
> I used to train other tech for tcp-ip, network and ethernet stuff..
> All this is pretty obvious if you have a basic training.. the you can bui=
ld
> on it..
>
> Here in Quebec we have training for our members on all this so they can k=
eep
> up pace with technology.. one good thing of regulation ;-))))-


I don't know what "regulation" would have to do with training but the
way I see it around here, there's a total lack of training in basic IP
networking skills. What I believe is the problem is a clash of
traditions. For as long as I can remember ( and that's a pretty long
time) since the alarm trade is  hardware based, manufacturers have
offered free seminars on installation techniques in the hope that you
would use their products. In the IP trade, they don't have any actual
hardware to sell, so the tradition has been, if you want to learn
about it, you have to pay for it. So, now, since the osmosis of the IP
trade into the alarm trade has been taking place, the seminars that
are being offered fall into the $150 to $250.00 range and alarm
companys and technicians aren't going to pay that kind of money to get
something that has always been available free of charge. Somebody has
got to smarten up and you know it's not going to be the alarm
installation companys. Thus it's going to take a reeeealy long time
before this gets to be routine in the trade.