Gigabit on LAN and WAN

Dears,
I would like to know if Gigabit ethernet on WAN uses the POS tehcnology ( packet over sonet ) or something else ( what ) ?
What is the maximum speed for gigabit on WAN ?
Concerning the MAN, is it true that Gigabit on MAN uses the DWDM technology or something else which has nothing to do with SONET ?
What is the maximum speed of Gigabit on MAN ?
Could you define the different protocols that we are meeting in the layers OSI 1-4 of Gigabit WAN and Gigabit MAN ?
Thanks for your respons !
Olivier MONTEE.

GigE is using the same technology as Fiber Channel 8B/10B coding. It is a switched technology 100 MBs or 200 MBs full dup. It can run on Optical or copper. the 1000T uses PAM-5 coding on Cat-5. To get a GigE over distance you will need DWDM to transport a full speed feed. Hope this helps narrow your question.

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Why would i connect a external hardrive to the airport extreme and what is the difference between LAN and WAN gigabit ethernet?

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Connecting a hard drive to the Airport Extreme makes it available to be shared across all the computers on your network.
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Lan and Wan port on Airport express

Hi guys I am wondering if you could help me out with my airport express.
I recently bought an airport express and have it set up as the following:
Router--->ethernet cable in to the Wan of Airport express--->ethernet from Airport Express Lan to computer
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is the main router also an apple product? if so, then yes you can extend wirelessly, but if the main router is an apple product, why are you bothering to extend wirelessly at all when the main router's signals should be strong enough?
if the main router is NOT an apple router, then you wil NOT be able to extend it wirelessly period.
in my experience, there are very FEW places you NEED to extend a network wirelessly, and i always recommend against it since there is a big performance decrease.
In the case of a wirelessly extended network, throughput may be reduced to less than 60 percent of that of a single device.
http://support.apple.com/kb/HT4145

Which Monitoring Tool is best to monitor LAN and WAN

Hi,
CAN ANYONE TELL ME Which Monitoring Tool is best to monitor LAN and WAN.
Waiting for immediate response.
Thanks
Irshad

To start with HP open, this is SNMP-based as well. As it is around for quite a while and delivers support for many vendors, it has become sort of an industry standard. Many other vendors deliver add-ons (even CiscoWorks) to support their products via HP open. That functionality however comes with a price. If you have plenty of money an a large network to manage, HP open might be your best choice.
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Regards,
Leo

Public LAN and WAN Addresses

Hi Guys
I am slightly confused about public lan and wan ips. We have a circuit that was installed a few months ago as a backup failover but we now want to start using it so I phoned my ISP for the public range for that circuit.
Now our internal IP subnet is a 192.168.150.xx
I was expecting the ISP to provide me with one public range maybe a /30 so I can assign an public ip to my routers external interface and PAT to that address.
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As Peter says it is worth talking to your ISP but LAN addresses are usually simply another public IP block you are free to use however you want.
You don't have to use them and you certainly don't need to allocate them to physical devices on your LAN. The ISP doesn't really care how you use them either, they will simpy route traffic to those address to your edge device (see below for more details).
They can be useful if you host a lot of servers/applications accessible from the internet for example.
It does depend on the devices you have ie.
LAN -> firewall -> ISP router
in the above you use the WAN addressing for the link between the firewall and the ISP router and then you can just use the LAN address range for NAT on your firewall. Non of the LAN IPs need to be actually assigned to any interface
LAN -> firewall -> router -> ISP router
here you have your own router on the outside of the firewall. The WAN addressing would be used between your router and the ISP router. The LAN addressing would be used for the firewall to your router connection and any spare IPs can be used for NAT (usually done on the firewall).
Note that usually the LAN addressing is a larger subnet than the WAN addressing and as you say the WAN addressing is usually a /30. So the ISP uses one of the IPs from the WAN range and you use the other.
If you have been allocated LAN addresses then the ISP will route traffic to these addresses to the WAN IP you have used so make sure you use the WAN IP on either -
a) in the first example above the outside interface of your firewall
or
b) in the second example above the outside interface of your router, the one connecting to the ISP router.
Hope that makes sense.
Jon

Data package size-LAN and WAN

HI Experts,
Could anybody give explanation/Document for the below query?
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Thanks
Pradeep

In transaction SBIW -> General Settings -> Maintain Control Parameters for Data Transfer (in the OLTP System), you can see and edit the default values for the source system.
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[417307 - Extractor package size: Collective note for applications.|https://websmp107.sap-ag.de/sap/support/notes/417307]
[409641 - Examples of packet size dependency on ROIDOCPRMS.|https://websmp107.sap-ag.de/sap/support/notes/409641]
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Load balance on routers LAN and WAN

Hi ;
I have a setup where i need to implement load balance on 2 routers in both sides ,LAN and WAN , and there is ASA in the LAN side , my question is that when do load blance in LAN side using GLBP how the 2 ASA's will act on this because they will have only 1 default gateway IP address .
Thanks

Not Harbi
Not entirely sure i understand the question but i'll try to answer based on a few assumptions.
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The load balancing aspect comes in when another host on the LAN then arps out for the default gateway and the AVG assigns it a different virtual mac address tied to a different router. But as the ASA pair always appear as one host entity they will always be tied to one of the routers at any one time.
Hope this covers what you were asking
Jon

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Just purchased an Airport Extreme , what´s the difference between LAN and WAN

just purchased an Airport Extreme , what´s the difference between LAN and WAN

Check the Setup Guide for the AirPort Extreme to confirm that the WAN port accepts the signal from your modem or from another router on your network.
Other Ethernet devices on your network connect to the LAN <-> ports.

Can't recognize airport via lan and wan cables??

Trying to add airport extreme to present set up of G4 desktop that presently is hooked up to an external high speed modem.
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power mac g4 dual 450 Mac OS X (10.4.1)

This has been very helpful.
I used airport setup asst. for windows and now have configured a secure wireless connection for my dell (dude). I used PPPoe since my internet provider uses it. Can't wait until Feb when I will be getting my power book.
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Also, it looks like the desktop is only compatible with airport and not airport express. Not sure where could find a card.
You have been very helpful through this so thank you very much.
Do you have any last advice?
Gord
power mac g4 dual 450 Mac OS X (10.4.1)

LAN and WAN share the same MAC address -- could this be a security issue?

When I bought the AEBS(n), I was a bit surprised to see only one ethernet MAC address listed (on bottom of unit, or was it in config utility?), in addition to wireless MAC. My main router has two ethernet MACs.
So last nite, I investigated. I confirmed my suspicion that both the WAN port and the LAN ports share the same MAC address! My setup has the AEBS WAN port plugged into my home LAN's main router, and a Linux machine plugged into a LAN port of the AEBS.
View of AEBS WAN side (from main router at 192.168.1.1)
ii# arp
Seconds IP Address MAC Address
734 66.130.224.1 001120A87AF5 -- ISP router
789 192.168.1.21 0016CBC430A6 -- AEBS WAN port
28 192.168.1.33 0010DC47DC53 -- home PC
824 192.168.1.73 00065BB2F295 -- work PC
View of AEBS LAN side (from a Linux box at 10.0.1.41)
root@LKG7CAE25 # cat /proc/net/arp
IP address HW type Flags HW address Mask Device
10.0.1.1 0x1 0x2 00:16:CB:C4:30:A6 * eth0
10.0.1.1 on the LAN side of AEBS and 192.168.1.21 on the WAN side of the AEBS both use the same MAC address, 00:16:CB:C4:30:A6.
I tried to provoke some leakage between the two sides (for example with broadcast packets), but haven't been able to do it so yet. Perhaps the switch in front of the eth MAC has enough smarts to keep the two subnets separate? Still it sort of worries me, if I used the AEBS as my only router, that both WAN and LAN go thru the same ethernet MAC (same h/w). I browsed here but found no discussion on this.
Comments anyone?

.... This is why there are separate MAC addresses
for ethernet and wireless, they are physically
different networks. In the case of the WAN/LAN, both
are ethernet-type networks but are physically
distinct (this is the purpose of a router like the
AEBS), so having the same MAC address on both sides
won't cause any sort of collision nor should it be
possible to leak across networks. MAC addresses can't
be used for routing beyond the physical network.
If it is indeed two different NICs sharing a single MAC, then indeed it is not an issue as you would never want to connect these two NICs together. But is it really two NICs?
My worry is that these two subnets are on the same physical network, with some magic going on to keep them separate anyway. Do we have some picture of AEBS internals? Maybe that would answer the question...

WCCP and WAN optimisation via Layer 3 connection

Hi There,
I need some help with WCCP, however with Riverbeds instead of WAAS.
The topology of the set up is as follows:
WAN - R1 - LAN - L3 Switch - Riverbed
The clients reside on the WAN side and the servers reside on the LAN side.
My business wishes to enable WCCP on two separate WAN routers to the single Riverbed. One router is fuly managed service, and the other rout the is managed by the business IT team.
All the articles that I have come across talk about enabling WCCP on the router whereby the WAN optimisation appliance is directly connected to a interface router. I need to configure WCCP to a Riverbed that is connected to a subnet that is a single hop away via a Layer 3 switch.
My plan is to enable WCCP in the inbound directions on both the LAN and WAN interfaces, however my concern is that this design will mean the traffic passing through the LAN side interface will be optimised twice.
Can any one confirm if this would happen? If it could happen can it potentially be stopped by placing a "ip wccp redirect exclude out" command on the LAN interface.
Thanks is advance for your help.

Hi Andreas,
"ip wccp redirect exclude out" only makes sense if you have a "ip wccp redirect out"
on a L3 interface on the router.
It's purpose is to avoid redirecting an already optimised packet, comming from a L3-interface where the WAAS/Riverbed device is connected, once more.
A double redirect will, in a WAAS setup, cause the WAAS device to drop the packet, because
it suspects a routing loop... don't know what Riverbed does.
Running only with "ip wccp redirect in" on both the WAN and LAN interface will cause :
1) a packet comming in from the LAN, is supposed to be unoptimised, and will be redirected
2) a packet comming in from the WAN, is supposed to be optimised, and will also redirected
3) an IP-interface with only the WAAS/Riverbed connected should NEVER be redirected !
If you cannot isolate your WAAr/Riverbed in it's own L3 subnet (subinterface/VLAN),
and therefore have to place it in the "ordinary" LAN subnet, packets from the WAAS/Riverbed will becomes candidates for redirection (even with "ip wccp redirect in"), you'll need to use "WCCP negotiated Return", but don't know whether Riverbed supports this,
Riverbed normally uses "tunnels" on the WAN side, and this makes the WCCP setup somewhat different.
You should really consult the Riverbed documentation or their support
... or migrate to Cisco WAAS ;-)
Best regards
Finn Poulsen

T410 - 2537AL8 LAN vs WAN

What is the difference in usage between LAN and WAN? When do I need the WAN Card?
Solved!
Go to Solution.

There's a Wireless LAN card (aka WLAN) which is your standard 802.11 Wi-Fi card.
There's also an option for a Wireless WAN card (aka WWAN) which uses cell-tower 3G internet.
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Can the Gigabit Ethernet LAN Port be used with a Thunderbolt to Gigabit Ethernet adaptor and then to a Thunderbolt Hard Drive as a back up drive?

Can the Gigabit Ethernet LAN Port be used with a Thunderbolt to Gigabit Ethernet adaptor and then to a Thunderbolt Hard Drive as a back up drive?

If you use ethernet to connect the two AirPort Extremes together, you'll have Gigabit speeds available at all of the ethernet ports on both routers.
If you connect the second AirPort Extreme using wireless only and configure the Extreme to "extend a wireless network", then the maximum speeds that the second router can attain will be limited to the capability of the wireless connection. So, if you connect at normal "n" wireless speeds of say 130 Mbps, that will be the maximum speed available at the ethernet ports on the second AirPort Extreme.
I think you can easily see the difference between Gigabit ethernet, which is 1000 Mbps compared to "n" wireless at 130 Mbps. Even if you can manage to connect at 5 GHz speeds for wireless, the max speed will be in the 300 Mbps range, more than 3 times slower than Gigabit ethernet. Normal "n" speeds will be about 7 times slower than ethernet.
For streaming high definition video and other demanding sources, you'll need as much bandwidth (speed) as you can get. Ethernet is always the best choice if you can possibly use it. And...there's no wireless interference on an ethernet connection.
Message was edited by: Bob Timmons

[solved] Troubleshoot ssh with keys (works from LAN, not WAN)

I'm trying to set up ssh so that I can connect to my work computer from home. It is pretty much essential that I keep the work box as secure as possible at all times. (So I can't disable the firewall, come home and test it because IT would not be at all happy.)
I'm not sure if this is an Arch question, a Fedora question or a general Linux/networking question.
The work box is running Fedora 17. It has a firewall eerily like the "simple stateful firewall" described on Arch's wiki. It is running sshd. Public key authentication is enabled. No other form of authentication is enabled. It has a rule allowing ssh connections.
My laptop is running Arch. It has a firewall very like that described on the "simple stateful firewall" page. It has a couple of rules allowing stuff I need at home (printer and something I had to enable for the LAN).
Initially, I was given an internal ip address. I got this working fine i.e. I could ssh into the box from my laptop while sitting next to it in my office over the LAN. I'm using the default form of key pair generated on Arch (i.e. rsa) and am using gpg-agent with ssh support in lieu of ssh-agent to manage keys. Pin entry is using the qt front end as I'm on KDE. (I adapted KDE's config so that it starts gpg-agent with ssh support for the session so that I didn't end up with two instances.)
Once the firewall was in place and sshd was running, they gave me a public ip address. At this point, no port was opened in their firewall to allow WAN connections but I tested the public ip address from within the LAN and it once again worked fine.
Once I'd confirmed the machine could connect out after getting a public ip, they arranged for the port to be opened for ssh. However, I cannot connect to the machine from home.
$ ssh -vvi .ssh/id_rsa [email protected]
OpenSSH_6.1p1, OpenSSL 1.0.1c 10 May 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 22: Applying options for xxx.xxx.xxx.x
debug1: /etc/ssh/ssh_config line 32: Applying options for *
debug1: auto-mux: Trying existing master
debug1: Control socket "/home/username/.ssh/[email protected]:nn" does not exist
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xxx.xxx.x [xxx.xxx.xxx.x] port nn.
debug1: connect to address xxx.xxx.xxx.x port nn: Connection timed out
ssh: connect to host xxx.xxx.xxx.x port nn: Connection timed out
xxx.xxx.xxx.x is the public ip (works fine from LAN)
nn is the port number
username is my user name (same on both machines)
The options for the host from ssh_config are:
AddressFamily inet
Compression yes
ControlMaster auto
ControlPath ~/.ssh/socket-%r@%h:%p
and the only generic option applied to all hosts is just a line to insist on protocol 2 which I think is default now anyway but I followed the wiki and specified it to be sure.
What have I missed? My networking knowledge is pretty basic at best. (I got this far using Arch's wiki, Fedora's documentation and a little trial and error. That seemed to work well but now I've added google and still can't figure it out. All the hits I get concern cases where the LAN connection works but authentication fails over WAN. But I'm not getting that far - it looks like my work box doesn't respond at all...)
Last edited by cfr (2012-09-25 22:12:06)

So I discovered I'd also managed to kill off LAN access as well as the machine's ability to use any sort of DNS... (I did say it needed to be secure...)
Anyway, I fixed that, reestablished working ssh from LAN but still can't get it to work from WAN.
Question: if ShieldsUp! reports the port as stealthed does that mean that the port has not actually been opened? So the campus firewall is blocking the connection? Because if so, I'm knocking my head against a brick (fire)wall to no purpose whatsoever...
I figure it can't be the software firewall else I'd not be able to connect on the LAN. And it is a public ip address so there's no NAT translation required...

Gigabit on LAN and WAN

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