VPLS MTU requirement

Hi All,
We are planning to run VPLS over the DSL link and i think MTU cab be an issue in such scenario as the MTU size will depends uppon the DSL provider settings. So i am not sure how to acheive this solution in terms of MTU issues and also can some one please guide me how to calculate the required MTU for running VPLS in DSL access media ?
MTU on interface to CE ?
MTU on interface to the Core ?
Thanks in advance guys.
Sree

Hi Sree,
the rule for MPLS (hence for VPLS too) is to have the highest MTU you can configure on the core interfaces. Usually ISPs have nowaday 9000.
If this is not possible for VPLS you need to take into consideration the following for Max Frame Size:
Max Frame Size = Link Header + Tunnel label + VC label + Control Word +Transported L2 Header + Payload.
Link Header is the one of your DSL circuit (likely using ATM link header.. anyway it something you should know/ask your provider).
Tunnel label + VC label + Control Word = 12 Bytes (4 bytes per label + 4 bytes for control word which is optional as it sepends on underlying transport media and on vendor implementation... anyway you should consider it)
Transported L2 Header = it depends on what you transport. For Ethernet II encapsulation with dot1q consider 18 bytes (or 14 bytes if customer vlan id is not transported. This depends on implementations once again).
So in the worst scenario where you have CW and you transport customer vlan id you need at least 1530 Bytes + the DSL link header on the core facing interface.
On the customer facing interface I would leave the interface MTU you have (1500 if it is Ethernet - even though the actual value is higher as it considers the L2 link overhead already). Or else you need to change the MTU on every host.. not too handy.
Riccardo

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    Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
    3-6' feet minimum safe distance between devices.
    Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
    http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=d9a3b1b2039741948a2365b053a93ea8_3759.xml&pid=80&r...
    http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-esse...

  • LinkSys E2500 Internet Problems

    Hello, I've recently bought an E2500 Wireless Router for my home, but every 1-2 days I've been having an issue. 
    The internet connection will suddenly drop. Upon checking the "Internet Connection" information, under "Status" I see that the internet IPv4 address field is all 0.0.0.0, when it usually is not. I've tried everything to fix this but the only thing that seems to work is for me to hold down the reset button until the router returns to factory settings then use the Installation CD to set back up my Wifi.
    After that it will work for a while then some time later stop yet again. It happens over and over again and I'm not sure what to do. I can confirm it's NOT the Internet Modem that's the problem, if I connect my laptop directly to the modem I get internet. And I've called my ISP but they say it's a problem with the Router itself. I Googled the issue and saw that some cable internet providers (My internet provider is cable based) require you to set the MAC Address Clone to "on" which I did and cloned my laptop's MAC but this too has not worked. Releasing and Renewing the IP address also does not work. 
    I THINK this happens everytime the DHCP Lease time runs out, but I am unsure. Any help that can be given on this would be appreciated, else I may have to return this router and get another. 

    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...
    For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.
    If the ISP modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>http://www.practicallynetworked.com/networking/fixing_double_nat.htm and http://cognitiveanomalies.com/cisco-nat-how-nat-works/ If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ. 
    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.
    Router Placement
    Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
    3-6' feet minimum safe distance between devices.
    Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
    http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=d9a3b1b2039741948a2365b053a93ea8_3759.xml&pid=80&r...
    http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-esse...
    darron13 wrote:
    Hello, I've recently bought an E2500 Wireless Router for my home, but every 1-2 days I've been having an issue. 
    The internet connection will suddenly drop. Upon checking the "Internet Connection" information, under "Status" I see that the internet IPv4 address field is all 0.0.0.0, when it usually is not. I've tried everything to fix this but the only thing that seems to work is for me to hold down the reset button until the router returns to factory settings then use the Installation CD to set back up my Wifi.
    After that it will work for a while then some time later stop yet again. It happens over and over again and I'm not sure what to do. I can confirm it's NOT the Internet Modem that's the problem, if I connect my laptop directly to the modem I get internet. And I've called my ISP but they say it's a problem with the Router itself. I Googled the issue and saw that some cable internet providers (My internet provider is cable based) require you to set the MAC Address Clone to "on" which I did and cloned my laptop's MAC but this too has not worked. Releasing and Renewing the IP address also does not work. 
    I THINK this happens everytime the DHCP Lease time runs out, but I am unsure. Any help that can be given on this would be appreciated, else I may have to return this router and get another. 

  • EA6900 Dropping Signal!!!

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    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...
    For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.
    What wireless modes are you using?
    2.4Ghz and 5Ghz routers: Try single mode G or N or mixed G and N on 2.4Ghz and single mode N or Mixed on 5Ghz?
    Channel Width set for Auto 20/40Mhz or try 20Mhz only.
    Try setting a manual Channel to a open or unused channel. 1, 6 or 11. 11 for single mode N if the channel is clear. 13 for EU regions. Try channel 48 or 149 on 5Ghz. http://en.wikipedia.org/wiki/List_of_WLAN_channels
    http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=f2625b15a5d7454b8e7fafbe65d5aa63_4009.xml&pid=80&r...
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    http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=19073
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    Any 2.4Ghz or 5Ghz cordless house phones or WiFi APs near by?
    Any other WiFi routers in the area? Link> Use http://www.techspot.com/downloads/5936-inssider.html to find out. Use v3. How many?
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    http://kb.linksys.com/Linksys/ukp.aspx?vw=1&articleid=5471
    Router Placement
    Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
    3-6' feet minimum safe distance between devices.
    Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.
    http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=d9a3b1b2039741948a2365b053a93ea8_3759.xml&pid=80&r...
    http://www.smallnetbuilder.com/wireless/wireless-basics/31083-smallnetbuilders-wireless-faq-the-esse...

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    Internet Service Provider and Modem Configurations
    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...
    If the ISP modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>http://www.practicallynetworked.com/networking/fixing_double_nat.htm and http://cognitiveanomalies.com/cisco-nat-how-nat-works/. If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ.

  • HELP with WRT160Nv2 (2 xbox one NAT)

    I have 2 xbox ones in my house connected to the WRT160Nv2 router. I have tried literally everything. Port forwarding, triggering, uPnP, static IP's, blah blah blah. From the research I've done uPnP should be the only thing necessary to run two xboxes at the same time in the same game. Is this router's UPNP just total garbage? Is there a firmware update that will solve my problem? Please link me if so. I am currently running Firmware Version: v2.0.02  . (probably the default, but doing a few google searches people say some firmware updates for this router make it worse)
    Please help me out because researching this stuff really gives me a headache after a while.
    If this matters... We are able to play in the same games occasionally but often times one or both of us will drop out from the game. It's especially bad in call of duty. Sometimes I will drop even if the other xbox isn't even turned on, so i don't even know where to start.

    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...
    If the ISP modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>http://www.practicallynetworked.com/networking/fixing_double_nat.htm and http://computer.howstuffworks.com/nat.htm If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ.
    Router and Wired Configurations
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    Ensure devices are set to auto obtain an IP address.
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    Set up port range triggering using 0 and 65535. 
    Keep uPnP enabled.
    Disable any firewall temporarily for testing. 
    Save settings and reboot the router. 
    After router is back to ready, turn on one XB1 and check NAT. Turn on the 2nd XB1 and check NAT.
    cliffordxxxx wrote:
    I have 2 xbox ones in my house connected to the WRT160Nv2 router. I have tried literally everything. Port forwarding, triggering, uPnP, static IP's, blah blah blah. From the research I've done uPnP should be the only thing necessary to run two xboxes at the same time in the same game. Is this router's UPNP just total garbage? Is there a firmware update that will solve my problem? Please link me if so. I am currently running Firmware Version: v2.0.02  . (probably the default, but doing a few google searches people say some firmware updates for this router make it worse)
    Please help me out because researching this stuff really gives me a headache after a while.
    If this matters... We are able to play in the same games occasionally but often times one or both of us will drop out from the game. It's especially bad in call of duty. Sometimes I will drop even if the other xbox isn't even turned on, so i don't even know where to start.

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