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What's the differences between

router contains a built-in switch
and
router without a built-in switch??

Some routers even have built-in firewall.

I saw many routers in the market has built-in switch, but I don't know
why, and what's the advantages?

please advise. thanks!!

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

jrefactors@hotmail.com wrote:

> What's the differences between
>
> router contains a built-in switch
> and
> router without a built-in switch??
>
> Some routers even have built-in firewall.
>
> I saw many routers in the market has built-in switch, but I don't know
> why, and what's the advantages?
>
> please advise. thanks!!
>
The combination might be cheaper than the two parts separately.
And then it's only one thing to plug in.

It's like stereo equipment. You can buy a receiver, or you can
buy separate amplifier and tuner and connect them together.

--
The e-mail address in our reply-to line is reversed in an attempt to
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<jrefactors@hotmail.com> wrote in message
news:1126761720.798936.250370@f14g2000cwb.googlegroups.com...
> What's the differences between
>
> router contains a built-in switch
> and
> router without a built-in switch??

A router with a built-in switch works on the same principles as a standalone
switch. A router with a built in switch can be configured to just be a
switch and not a router by disabling the DHCP server on the router and then
it's just a standalone switch.

http://www.homenethelp.com/web/exp [...] itches.asp

I don't know about routers without a built-in switch.

>
> Some routers even have built-in firewall.

Some routers use a packet filter FW solution like SPI some don't and some
routers use more than SPI a more powerful packet filter.

Most NAT routers for home usage fall into the category of the link below.

http://www.homenethelp.com/web/explain/about-NAT.asp

About firewalls

http://www.more.net/technical/netserv/tcpip/firewalls/

What does a computer, router or appliance running a network/Internet FW do?

http://www.firewall-software.com/f [...] ll_do.html

>
> I saw many routers in the market has built-in switch, but I don't know
> why, and what's the advantages?

see link above about hubs and switches

Duane

Archived from groups: comp.security.firewalls (More info?)

In comp.security.firewalls jrefactors@hotmail.com wrote:
> What's the differences between
> router contains a built-in switch
> and
> router without a built-in switch??

If routers are also switches, then they're offering both of these two
functionalities:

http://en.wikipedia.org/wiki/Router
http://en.wikipedia.org/wiki/Network_switch

A router works layer 3, a switch works layer 2 in the OSI reference
model, see http://en.wikipedia.org/wiki/OSI_m [...] _of_layers

> Some routers even have built-in firewall.

That usually means, that the devices have some extra filtering
functionality.

Yours,
VB.
--
"Es kann nicht sein, dass die Frustrierten in Rom bestimmen, was in
deutschen Schlafzimmern passiert".
Harald Schmidt zum "Weltjugendtag"

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CJT wrote:
> The combination might be cheaper than the two parts separately.
> And then it's only one thing to plug in.
>
If I only want to connect to 3 PC in a LAN, the router has 4 ethernet
ports and it can do the job. If I want to connect more than 4 PC, then
I need a switch. This is the scenario of two parts separately.

I still don't understand because router with built-in switch has 4
ports also, how does it function as the combination of router and
switch together?

Here's different types of routers I looked at:

http://www.linksys.com/servlet/Sat [...] torWrapper

BEFSR41 EtherFast® Cable/DSL Router with 4-Port Switch V4.0 (4 ports)
BEFSR11 EtherFast® Cable/DSL Router (1 port)
BEFSR81 EtherFast® Cable/DSL Router with 8-Port Switch V3.0 (8 ports)

Another question, if the router has more than 1 port, then it must be
router with built-in switch. Is that correct assumption? Because the
traditional broadband router should only has 1 port?


please advise more... thanks!!

Archived from groups: comp.sys.ibm.pc.hardware.networking,comp.security.firewalls (More info?)

In comp.security.firewalls jrefactors@hotmail.com wrote:
> I still don't understand because router with built-in switch has 4
> ports also, how does it function as the combination of router and
> switch together?

A router is doing packet forwarding in a special way in layer 3, while
a switch is doing frame forwarding in layer 2, see:

http://en.wikipedia.org/wiki/Router
http://en.wikipedia.org/wiki/Network_switch
http://en.wikipedia.org/wiki/OSI_m [...] _of_layers

> Another question, if the router has more than 1 port, then it must be
> router with built-in switch. Is that correct assumption?

No. A router at least has two network interfaces, because it's a
multi-homed host.

Yours,
VB.
--
"Es kann nicht sein, dass die Frustrierten in Rom bestimmen, was in
deutschen Schlafzimmern passiert".
Harald Schmidt zum "Weltjugendtag"

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

jrefactors@hotmail.com wrote:

> CJT wrote:
>
>>The combination might be cheaper than the two parts separately.
>>And then it's only one thing to plug in.
>>
>
> If I only want to connect to 3 PC in a LAN, the router has 4 ethernet
> ports and it can do the job. If I want to connect more than 4 PC, then
> I need a switch. This is the scenario of two parts separately.
>
> I still don't understand because router with built-in switch has 4
> ports also, how does it function as the combination of router and
> switch together?
>

in essence, its switch has 5 ports -- the fifth one hooks (internally)
to the router -- but they say it has 4 ports because those are the
external ones you can see

> Here's different types of routers I looked at:
>
> http://www.linksys.com/servlet/Sat [...] torWrapper
>
> BEFSR41 EtherFast® Cable/DSL Router with 4-Port Switch V4.0 (4 ports)
> BEFSR11 EtherFast® Cable/DSL Router (1 port)

I had one of these. I wasn't happy with it. I suspect I wouldn't be
happy with the others, either.

> BEFSR81 EtherFast® Cable/DSL Router with 8-Port Switch V3.0 (8 ports)
>
> Another question, if the router has more than 1 port, then it must be
> router with built-in switch. Is that correct assumption?

yes (theoretically it could be a hub rather than a switch, but I doubt
anybody does that)

Because the
> traditional broadband router should only has 1 port?
>
>
> please advise more... thanks!!
>


--
The e-mail address in our reply-to line is reversed in an attempt to
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Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

From: "CJT" <abujlehc@prodigy.net>

< snip >

|
| yes (theoretically it could be a hub rather than a switch, but I doubt
| anybody does that)
|

< snip >

An Ethernet switch can NOT be a hub. Hubs only re-time signals. Hubs are basically
multi-port repeaters. Switches have active electronics to decide what MAC address packet
goes to what port and have a cache to memorize MAC addresses. On an E-switch, each port is
a collision domain. On a hub all ports are on the same collision domain. Therefore a
E-switch can not be a hub and vice versa. This is not theory, it is a fact.

As for the Linksys Routers they are all good. Albeit, I have yet to install a BEFSR41 v4.0

You had one. I have installed many !

I have installed numerous BEFSR41 v1, v2 and v3 Routers. No problems with any.
I am presently using a BEFSR81, a business class Router that support QoS. I have installed
all v1, v2 and v3 but just nearly as many as the BEFSR41 models.

The BEFSR11 is a waste unless one already owns or plans to own a managed Ethernet switch.

--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

From: <jrefactors@hotmail.com>

|
| CJT wrote:
>> The combination might be cheaper than the two parts separately.
>> And then it's only one thing to plug in.
>>
| If I only want to connect to 3 PC in a LAN, the router has 4 ethernet
| ports and it can do the job. If I want to connect more than 4 PC, then
| I need a switch. This is the scenario of two parts separately.
|
| I still don't understand because router with built-in switch has 4
| ports also, how does it function as the combination of router and
| switch together?
|
| Here's different types of routers I looked at:
|
|
http://www.linksys.com/servlet/Sat [...] torWrapper
|
| BEFSR41 EtherFast® Cable/DSL Router with 4-Port Switch V4.0 (4 ports)
| BEFSR11 EtherFast® Cable/DSL Router (1 port)
| BEFSR81 EtherFast® Cable/DSL Router with 8-Port Switch V3.0 (8 ports)
|
| Another question, if the router has more than 1 port, then it must be
| router with built-in switch. Is that correct assumption? Because the
| traditional broadband router should only has 1 port?
|
| please advise more... thanks!!


Get the Linksys BEFSR41. It will allow you to connect four computers (or any TCP/IP
Ethernet devices such as a Print Server or a game box [ XBox, Playstation/2, etc.]) If you
plan on 5 or more computers than you can gert the BEFSR81.

You said "...how does it function as the combination of router and switch together? "

Think of the device as a Black Box. On the input side (WAN) it connects to an Internet IP
address. On the output side (LAN) it fans out to four connections. Inside that Black Box,
the device uses Network Address Translation (NAT) to take a WAN IP address (i.e;
71.254.72.3) and based upon the requests made by a PC on the LAN side will translate the IP
address to a Private Address such as 192.168.1.100.

All you have to know is that the device uses NAT to convert any of the addresses in the
following range (192.168.1.2 ~ 192.168.1.254) to the address obtained from the Internet
side. That's the NAT Router part. On the LAN side you can connect up to 253 computers.
This is obtained by chainingg hubs or Ethernet switches to the LAN side of the Router. The
BEFSR81 already supplies you with 8 ports for up to 8 computers. The BEFSR41 already
supplies you with 4 ports for up to 4 computers. However if you chain an Ethernet switch
(or hub but switches are preferred) than you can multiply the number of computers.

For example; Using the BEFSR41 and a 12-port Ethernet switch that has 1 upload port and 12
usable ports.
Three computers would connect to the BEFSR41. The Ethernet switch's upload port would be
connected to the fourth port on the BEFSR41. Thus with this combination, you can have up to
15 Ethernet devices using the Router.

--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

jrefactors@hotmail.com wrote in
news:1126883449.566340.26660@o13g2000cwo.googlegroups.com:

>
> CJT wrote:
>> The combination might be cheaper than the two parts separately.
>> And then it's only one thing to plug in.
>>
> If I only want to connect to 3 PC in a LAN, the router has 4 ethernet
> ports and it can do the job. If I want to connect more than 4 PC, then
> I need a switch. This is the scenario of two parts separately.
>
> I still don't understand because router with built-in switch has 4
> ports also, how does it function as the combination of router and
> switch together?
>
> Here's different types of routers I looked at:
>
> http://www.linksys.com/servlet/Sat [...] ayout&pack
> edargs=c%3DL_Product_C1%26cid%3D1118334622279&pagename=Linksys%2FCommon
> %2FVisitorWrapper
>
> BEFSR41 EtherFast® Cable/DSL Router with 4-Port Switch V4.0 (4 ports)
> BEFSR11 EtherFast® Cable/DSL Router (1 port)
> BEFSR81 EtherFast® Cable/DSL Router with 8-Port Switch V3.0 (8 ports)
>
> Another question, if the router has more than 1 port, then it must be
> router with built-in switch. Is that correct assumption? Because the
> traditional broadband router should only has 1 port?
>
>
> please advise more... thanks!!
>

The links below explain connecting two Linksys routers together. It
doesn't matter which ones or if it's wired or a wireless router or any
brand name of routers for home usage like D-link, Netgear, Belkin and
whatever.

The long version

http://linksys.custhelp.com/cgi-bi [...] d_adp.php?
p_faqid=358&p_created=1084209764
&p_sid=FJfGf8Dh&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX
3Jvd19jbnQ9MjM1JnBfcHJvZHM9MSwwJnBfY2F0cz0mcF9wdj0xLjE7Mi51MCZwX2N2PSZwX3
NlYXJjaF90eXBlPWFuc3dlcnMuc2VhcmNoX25sJnBfc2NmX2xhbmc9MSZwX3BhZ2U9MSZwX3N
lYXJjaF90ZXh0PXdpcmVsZXNzIHRvIHdpcmVk&p_li=&p_topview=1

The short version

http://tinyurl.com/9nvq7


You disable the DHCP server on the router, then it's no longer a router
it's a switch. It has the same functionality as if you went out and
brought a dedicated *switch* box and plugged it into the gateway router.

Even when the router is in router mode, it's using the built-in switch
technology for overall speed and performance of the router that the
router wouldn't have without the *switch* technology.

AGAIN

http://www.homenethelp.com/web/exp [...] itches.asp

Duane

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

David H. Lipman wrote:
> From: "CJT" <abujlehc@prodigy.net>
>
> < snip >
>
> |
> | yes (theoretically it could be a hub rather than a switch, but I doubt
> | anybody does that)
> |
>
> < snip >
>
> An Ethernet switch can NOT be a hub.

That's like saying red can't be green. I didn't say a hub could be a
switch. I said a hub could be combined with a router, just as a switch
can be combined with a router. But I doubt anybody does.

Hubs only re-time signals. Hubs are basically
> multi-port repeaters. Switches have active electronics to decide what MAC address packet
> goes to what port and have a cache to memorize MAC addresses. On an E-switch, each port is
> a collision domain. On a hub all ports are on the same collision domain. Therefore a
> E-switch can not be a hub and vice versa. This is not theory, it is a fact.
>
> As for the Linksys Routers they are all good. Albeit, I have yet to install a BEFSR41 v4.0
>
> You had one. I have installed many !
>
> I have installed numerous BEFSR41 v1, v2 and v3 Routers. No problems with any.
> I am presently using a BEFSR81, a business class Router that support QoS. I have installed
> all v1, v2 and v3 but just nearly as many as the BEFSR41 models.
>
> The BEFSR11 is a waste unless one already owns or plans to own a managed Ethernet switch.
>


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The e-mail address in our reply-to line is reversed in an attempt to
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David H. Lipman wrote:
<snip>
>
> As for the Linksys Routers they are all good. Albeit, I have yet to install a BEFSR41 v4.0
>
> You had one. I have installed many !

I suppose YMMV. I had problems with mine. This was when they first
came out, and the firmware was pretty unstable (and, IMHO, buggy).
>
> I have installed numerous BEFSR41 v1, v2 and v3 Routers. No problems with any.
> I am presently using a BEFSR81, a business class Router that support QoS. I have installed
> all v1, v2 and v3 but just nearly as many as the BEFSR41 models.
>
> The BEFSR11 is a waste unless one already owns or plans to own a managed Ethernet switch.
>
.... or an unmanaged switch.

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From: "CJT" <abujlehc@prodigy.net>

| David H. Lipman wrote:
>> From: "CJT" <abujlehc@prodigy.net>
>>
>> < snip >
>>
|>> yes (theoretically it could be a hub rather than a switch, but I doubt
|>> anybody does that)
|>>
>> < snip >
>>
>> An Ethernet switch can NOT be a hub.
|
| That's like saying red can't be green. I didn't say a hub could be a
| switch. I said a hub could be combined with a router, just as a switch
| can be combined with a router. But I doubt anybody does.

That's not what you said.. What you said is above < snip> and that is what I responded to.
Now if you meant something else, your wording made it come out differently.

--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm

Archived from groups: comp.sys.ibm.pc.hardware.networking,alt.comp.networking.routers,comp.security.firewalls (More info?)

David H. Lipman wrote:

> From: "CJT" <abujlehc@prodigy.net>
>
> | David H. Lipman wrote:
>
>>>From: "CJT" <abujlehc@prodigy.net>
>>>
>>>< snip >
>>>
> |>> yes (theoretically it could be a hub rather than a switch, but I doubt
> |>> anybody does that)
> |>>
>
>>>< snip >
>>>
>>>An Ethernet switch can NOT be a hub.
>
> |
> | That's like saying red can't be green. I didn't say a hub could be a
> | switch. I said a hub could be combined with a router, just as a switch
> | can be combined with a router. But I doubt anybody does.
>
> That's not what you said.. What you said is above < snip> and that is what I responded to.
> Now if you meant something else, your wording made it come out differently.
>
Apparently I was imprecise, leaving the antecedent to "it" dangling and
unclear. Sorry.

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