Setting WAN port MTU?

I mentioned in another thread that I had been having some problems with NAT on the AEBS. I think I narrowed it down to something going on between my DSL router and the AEBS.
I believe the DSL router needs to have an MTU of 1460 or fewer bytes per packet. Probably becuase it encapsulates TCP/IP before sending over its DSL ATM link.
I was able to get similar broken behavior when I replaced the AEBS with a similarly configured Linksys WRT54GS and forced the MTU to 1500 in the WRT's web managment tool.
It looks like MTU set to "auto" or 1460 or fewer bytes per packet makes the WRT54GS behave nicely with the DSL modem. Presumably, that would make the AEBS happy too... if I could find a place to set the WAN port's MTU. Anybody know how to do it?
The DSL router is about a five year old Siemens Speedsteam connected by ATM to the telco's DSLAM. Perhaps newer DSL routers do something a little smarter with packet encapsulation, fragmentation and reassembly. Not mine, by the looks of it.
Thanks,
Bill

I just waned to add, the Speedstream is taking care of the PPPOE itself. The model I have is the 5861, which is a full-blown IP router. I am getting a /27 block of IPs routed to me by my ISP.
If not the MTU size, perhaps the AEBS is setting the DF bit (Don't Fragment) bit in the IP header, so if the Speedstream needs to fragment a big packet because it is slapping on additional encapsulation for PPPOE, it has to drop the packet from the AEBS because the packet is over 1500 bytes when encapsulated.
The issue is only a problem when certain ports (say, 473 for instance) are NATted. Port 80 seems to be no problem. Unfortunately, there is more than basic HTML in this world.
Bill

Similar Messages

Setting WAN Port Speed on RV180

We have an RV180 and can not get connected to a port on CPE equipment after setting the WAN port on the RV180 to 100/Full.
The CPE equip port is set to 100 Mb/Full Duplex. When the port on the RV180 WAN is set to AUTO and we connect to the CPE we see a lot of CRC errors and very poor performance. When we set the RV180 WAN Port to 100/Full we see no traffic at all.
We have a Cisco ASA 5150 router connecting to the a different port on the same CPE and when we set its port to 100/Full we see very good performance.
We have upgraded the RV180 to the latest FW (1.0.3.10) but that didn't solve the problem.
Can anyone provide assistance with setting the WAN port to 100/Full with success?
Thank you,
John

Hi John, incrementing CRC errors traditionally indicate a physical problem. I've not known it to indicate anything different.
-Tom
Please mark answered for helpful posts

WRVS4400N Hard Set WAN port speed and duplex???

Does anyone know if there is a way to hard set the wan port speed and duplex on a WRVS4400N V2 router?
Any Help greatly appreciated..
thanks,

Michael
I believe that these statements are true.
Auto negotiation is good when both sides are configured to negotiate. When one side does not negotiate the other side should not try to negotiate.
HTH
Rick

MI424WR-GEN2 set WAN port to work as LAN

Hello,
Is there any chance to make WAN port of MI424WR-GEN2 to work as LAN?
I have multiple devices and need one more wired port.
Thanks a lot for your replies.
Solved!
Go to Solution.

No. The WAN port cannot be used for LAN connectivity.
If you need more Ethernet ports, buy an Ethernet swtich. If 100Mbps is fast enough, 10/100 switches are quite inexpensive. 1Gbps switches can be found for decent prices as well.
Good Luck.
If a forum member gives an answer you like, give them the Kudos they deserve. If a member gives you the answer to your question, mark the answer as Accepted Solution so others can see the solution to the problem.

I am unable to set up my new Time Capsule with my BT Home Hub - every time i connect the ethernet cable from Wan port to Home Hub, the internet signal drops

Hi there -
I've just purchased a new Time Capsule, and would like to set up a small home network with my Laptop, iMac and wireless printer. I'm following the first steps, but as soon as I connect an ethernet cable between the WAN port of the TC and the ethernet port of the HH, my BT internet connection drops out and I have to restart the HH. Upon which point it drops out again. The airport utility can see my TC, and gets as far as me typing in the new network name and setting up a password, but then it can't quite get through to the next stage. All the time it's just flashing amber.
Please help!

Setup the TC in bridge mode before you cannot it to the HH.
Simply do the setup fully in isolation. And do it by ethernet.
Setup wireless to create a wireless network.
You can use either same SSID =Wireless name as the HH .. same security same password.
Or use a different name and setup.. totally up to you.
Update the TC and then plug it into the HH by ethernet.

I have Fios. I have the TC connected via ethernet to the Fios router. TC WAN port ethernet to Fios Lan port. Then I just have the TC create a wireless network that is different than the Fios wireless network. How do I set up an Airport Extreme to the TC?

The Airport Extreme is a 4th Gen unit. I just want to keep the TC wireless name to go further through my house.

The Ethernet connection will be from one of the LAN <-> ports on the TC to the WAN port (circle of dots icon) on the AirPort Extreme.
Then you can use AirPort Utility - Manual Setup to configure the AirPort Extreme as follows:
Click the Wireless tab located just below the row of icons
Wireless Mode = Create a wireless network (Not "extend a wireless network" as many users incorrectly think)
Wireless Network Name = Same name as your TC network
No check mark needed next to "Allow this network to be extended"
Radio Mode = Automatic
Channel = Automatic
Wireless Security = Same setting as the TC network
Wireless Password = Same setting as the TC network
Confirm Password
Click the Internet icon
Click the Internet Connection tab
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Update to save settings and restart the entire network
Computers on the TC network will now be able to move to the area where the AirPort Extreme is located and not have to "switch" networks. This is known as a "roaming" network.

Time Capsule Internet WAN port is not working, what can I do to set it up?

When I plug the ethernet cable from my router to my Time Capsule it should turn on a green light in the back of the TC, but this light is not turning it on anymore, and this port is not working, how can I set it up?
I want to create a wireless network with the TC, but if this port (Ethernet WAN port) doesn't work, I can't, or can I? How?
Then I want to use my 2 Airport Express to use the network that I want to create.
I hope you can help me, thanks a lot.

what model is the TC? A1xxx from the base please.
How old and is the front LED otherwise showing it is operating OK?
What is the network setup..? Is the TC bridged or router.. or is it in Join wireless network mode now..
If the later.. the ethernet ports are turned off.. you need to do a factory reset of the TC.
Factory reset.. Hold in reset button.. THEN power on the TC.. keep holding in reset for about 10sec until the front LED flashes rapidly.. there is a good chance the ethernet will work now.

RVS4000 WAN PORT set to 1000Mbit

Is there a way to set the WAN Port to 1000Mbit? My Cablemodem supports up to 1000Mbit on the interface but the RVS4000 only runs at 100Mbit WAN Port speed.
It would be great to have the same options as for the LAN ports to change sensing also on the WAN port.
Thanks.

Hi Gonzalo,
The RVS4000 router can only allow one WAN IP address at a time. The RV series routers (RV042, RV082, and RV016) can allow multiple WAN IP addresses for load balancing or failovers.

Airport Utility: Ethernet WAN Port setting

In Airport Utility > Internet > Internet Connection .. is a property called "Ethernet WAN Port". The default setting is "Automatic (Default)".
When I set this property to "1000 Mbps/Full Duplex" Airport Utility throws two interesting errors:
1) You have nothing plugged into your WAN port (But I do have my Comcast modem plugged in there)
2) You don't have internet.
Upon Visual inspection of the Comcast modem, my IP connection to the house is gone. Specifically the green "PC" light is off.
Now, when I change this property back to "Automatic (Default)" my IP connection comes back again.
Does anyone have any thoughts or advice on why this is? I should also mention one more interesting thing ...
When downloading a 40min (1 hour TV show) from iTunes it takes 15 minutes when my Mac is direct connected to the Comcast modem and 3 hours when my Mac is connected to the AEBS. I'm trying to change the "Ethernet WAN" property to 1000 Mbps/Full Duplex to ensure smooth connection from Mac to AEBS to Comcast Modme to Internet.
Thanks!

Bob, thanks. Makes sense.
Do you have a notion of why the Comcast speed is cut when AEBS is connected to it vs. when the MacBookPro is directly connected to it?
Example: Download 1.1GB file from iTunes (Episode 1 of Lost) - a 40 minute TV show
Test 1: MacBookPro > WiFi (802.11n) > AEBS > Comcast Modem = 3 Hours (longer than show!)
Test 2: MacBookPro > Ethernet > AEBS > Comcast Modem = 3 Hours
Test 3: MacBookPro > Ethernet > Gigabit Switch > AEBS > Comcast Modem = 3 Hours
Test 4: MacBookPro > Ethernet > Comcast Modem = 15 MINUTES
Thanks,
Brian

Activity logging for WAN port on WRT1900ac

Hi everybody, I'm looking to monitor the activity on the WAN port. When the WAN goes on/off line, to find out when I loose connection with my internet provider. I know where to monitor the use of the ports being used, but I'm looking specific to the connects / disconnects on my WAN port towards my provider. Has anybody have suggestions?
John

What region are you located?
Has a Factory Reset been performed?
Was a Factory Reset performed before and after any firmware updates then set up from scratch?
Internet Service Provider and Modem Configurations
What ISP Service do you have? Cable or DSL?
What ISP Modem Mfr. and model # do you have?
Is ISP Modem/Service using Dynamic or Static WAN IP addressing?
What ISP Modem service link speeds UP and Down do you have?
Check cable between Modem and Router, swap out to be sure. Link>http://en.wikipedia.org/wiki/CAT6 is recommended.
Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask.
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=88e63d78588142e6bb68e22d7faf2046_Configuring_the_M...
I recommend that you have your ISP check the cabling going to the ISP modem, check signal levels going to the ISP modem. For cable Internet, RG-6 coaxial cable is needed, not RG-59. Check for t.v. line splitters and remove them as they can introduce noise on the line and lower the signal going to the ISP modem. Connecting to the ISP modem could result in a false positive as the signal to the modem could be just enough to that point then adding on a router, could see problems. Ensure modem is working well too. Bad modems are out there as well. The router operation is dependent upon getting good data flow from the ISP modem and the modem is dependent upon getting good signal from the ISP Service.
Not sure if using the following will have information on WAN port activity:
192.168.1.1\sysinfo.cgi

Does the WAN port in client mode on the Airport Express?

On an Airport Express (2012 version, 802.11n), has anyone tried the following configuration? Is the WAN port active in client mode? Do you have any suggestions on this or similar configurations?
I am trying to use Airplay to stream music to two Klipsch G-17 speakers. As I have discovered and also documented by Apple on their web page http://support.apple.com/kb/HT4587 in the section
"Connecting to an existing Wi-Fi network as part of a legacy WDS or Extended Network", this is true "Due to the overhead required for this configuration, you may expect AirPlay drop-outs such as intermittent loss of audio."
Configuration now:
All Airport Expresses are the 2012 802.11n version with a LAN and a WAN port.
There is one Airport Express in a home basement. It is connected to an Internet connection. This Internet connection goes into this home basement.
There is a second Airport Express on the second floor of this home.
Now, both Airport Expresses connect fine with the "extend network" option. There is wifi coverage throughout this home. All works fine until Airplay is used to stream music to these two Klipsch G-17 speakers. There are intermittent and persistent pauses. I am experiencing the what Apple documented in this kb article. I am not able to connect the two Airport Expresses with an ethernet cable. I cannot run a cable from the basement to the second floor.
Has anyone tried this following configuration? Or is there a different configuration that would work, and if so, could you provide the configuration details?
1. Connect the first Airport Express via client mode to the second, second floor Airport Express.
2. Set the network default gateway to the first, basement Airport Express.
The attempt is to eliminate the extended network, with its Airplay dropouts. And allow access to the Internet via the wifi network.
- end -

If the Express joins a wireless network wirelessly, in other words its WAN port isn't connected to anything, the correct way to connect a wired client to it is by using its LAN port.
I don't know what would happen if you were to connect a wired client to its WAN port instead — it's just not supposed to be used for that purpose. It won't permanently break anything if you were to try it though. If you were, the worst that would occur is that your network would become unresponsive as packets continuously traverse its WAN port in a circular fashion, which might require that you power down your router to reset your whole network.
If you are already using your Express's LAN port and you need another, the way to provide more ports is to purchase an inexpensive ($10 or so) switch. Connect it to the LAN port and as many other pieces of equipment as the switch's available number of ports.
You're correct about the first generation with the single Ethernet port. It could be used in either capacity depending on its configuration.

Can't configure both WAN ports on 1811 with SDM

Hi,
We recently procured an 1811 router to replace a SOHO linksys at a store we service. We needed redundant WAN interfaces to use the DSL as a backup to the main cable connection, and a Linksys RV082, while doing the job when it actually worked, died repeatedly. We decided after looking at the 1811's feature set to just get the Cisco and be done with it and not monkey with SOHO gear anymore.
Where I'm having difficulty is SDM won't let me configure both WAN interfaces from the GUI, it only allows me to configure one. I have it configured, and the router is working nicely in the test lab but I need to get that other interface configured and failover enabled before I can put this thing into production.
What am I doing wrong? Do I need to suck it up and learn IOS?
Thanks,
Todd Phipps
Certco, Inc.

I ended up figuring out the IOS commands to enable one fastethernet port as a primary and the other one as a backup (running both cable and DSL for redundancy; it's a grocery store that runs electronic transactions over IP so 100% availability is a must).
The trouble I was running into in SDM is that while it would allow me to configure one WAN port through the GUI, the config options for the second one were grayed out. Now that both are configured through IOS the edit buttons for both WAN interfaces appear normally in SDM. It's almost as if Cisco didn't want users to be able to configure both interfaces graphically for initial setup.
Now just to test it at the site before the store opens to see if the failover works...
Todd

Using the WAN port as a "LAN" port on the Airport Extreme Base Station...

Hi everyone,
I'm re-building my home wireless network and I'm doing so in preparation for the Slingbox AV I ordered last week. Here's my current setup:
I have a DSL modem attached to an Airport Express (802.11n) in my office broadcasting my internet signal. I have an Airport Extreme Base Station (802.11g) set up in my living room as a WDS extender. I currently use the base station in my living room to connect the DishNetwork ViP722 DVR to the internet and allow me to set recordings remotely on my iPhone when I'm away from home. I use the LAN port on the base station to do this, and now with the Slingbox on the way (should be here early next week), I'm wondering what I need to do to make an internet connection available for the Slingbox AV.
My question: Will I be able to simply use the WAN port as a "LAN" port since the Airport Extreme Base Station is being used as a WDS? It'd be awesome if the WAN port would become, essentially, a LAN port since it isn't being used.
Thanks in advance for your advice and insight!

slugoo wrote:
My question: Will I be able to simply use the WAN port as a "LAN" port since the Airport Extreme Base Station is being used as a WDS? It'd be awesome if the WAN port would become, essentially, a LAN port since it isn't being used.
I'd be surprised if that worked. The operation of an AirPort base station depends on keeping the WAN port and the LAN port(s) separate, as those normally are on two different networks.
You might consider buying an Ethernet hub or switch, which would allow your AirPort Extreme's LAN port to be shared. Here's an example of an inexpensive one:
http://www.bestbuy.com/site/olspage.jsp?skuId=7169244&st=ethernet+switch&type=pr oduct&id=1110266457435

WAN port without DHCP/NAT on WRTP54G

(Sorry if this issue was already discussed - I couldn't find it using Advanced Search) I find that my new WRTP54G works fine, supporting VoIP and several PC clients via its LAN switch, providing I enable its DHCP and NAT function. This is with the DSL modem connected to the WRTP54G's WAN port, as required for the VoIP module to access the internet. However, this configuration (the factory default) results in "double NAT" when used with my DSL modem. (This situation is evident by inspecting the HTML status screens of the respective equipments.) The obvious solution would be simply to disable DHCP and NAT in the WRTP54G and let the DSL modem do the hard work. However, disabling DHCP/NAT within the WRTP54G essentially shuts down all PC client access to the internet. The symptoms resemble a situation where packets are not being properly routed between the WRTP54G's LAN switch side and its WAN port (although I don't know whether that is the precise cause or not). On my previous WRT54G router used with a PAP2T, I saw the same behavior but the workaround was simple: move the DSL modem Ethernet port connection from the WRT54G WAN port to one of its LAN switch ports. Problem solved at the expense of occupying one of the four available LAN switch ports. Such workaround is not applicable to the WRTP54G due to the previously mentioned requirement of its VoIP module. Has anyone got their WRTP54G (or for that matter, WRT54G) working properly with its WAN port as a simple (non-DHCP/NAT) router? Please note my preferred Internet Connection Type (on the WRTP54G opening Setup page) is "Obtain an IP automatically" although a solution using "Static IP" would be OK. I am looking for a portable solution (for hotel rooms etc.), so I can't set the WRTP54G to "PPPoE" as suggested in some other forums. Thanks in advance for any help!

Use the Modem connected to WAN Port of the wireless router ....
In such case you can use the DHCP of the router also & other computers using the client services can work .....
Make sure that the Ip address should not conflict between the Vonage router & Linksys router .....
I think that Vonage is giving Ip - 192.168.15.1 ...& the default Ip for Linksys router is 192.168.15.1 ..... change the Ip for any of the router or modem to 192.168.20.1 .....
Also under Linksys router once you open the setup page ....
Leave the Internet Connection type to "Obtain an Ip automatically"
Click "MAC address clone"
Click enable & click clone
Click save settings ....
See if you are able to go online or not ....

WAN port limited to 10mbps on PPPoE

Hello,
I'm having trouble with the WAN port on my Airport Extreme. I got FTTC (fibre) coming into a VDSL2+ modem. When I connect my Mac directly to that I get roughly 70mbps download speed. But when using the Airport Extreme my connection caps at 10mbps! I have the 3rd generation, so all ports should be gigabit ethernet ports.
I saw some other posts here suggesting to set the WAN port settings in Airport Utility. I can't find those in the latest utility, so downloaded Airport Utility 5.6, changed from PPPoE to Ethernet, set the WAN speed to 1000 duplex and set it back to PPPoE. Now it refused to connect at all and claimed the cable was unplugged. Not until I went in and set Ethernet to "automatic" did it connect again via PPPoE. So it seems that my Airport Extreme refuses to use a faster ethernet connection than 10mbps when using PPPoE.
Any solution to this? There clearly is something wrong here! I contacted my ISP and they said that they have reports from other users of the Airport Extreme with the same problem.

You didn't mention this, but it could be as simple your cable from the modem to the router. If you are using a Cat5 Ethernet cable, you need to be using a Cat5e or Cat6 cable. I use Cat6 cables on my network because they are certified to run at Gigabit speeds. Cat5e is not certified but can work on a Gigabit network.
Also, when you direct connect your Mac to the AEBS you should be getting download speeds well over 100 Mbps, depending upon your system provider and what speed you're paying for. This leads me to believe it's the cable.

Setting WAN port MTU?

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