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Cisco 3800 Wan link

mikeleahy
Beginner
Beginner

hi,

we are linking 2 offices using a private vpn using dedicated lines with cisco 3810-v routers. Each office has its own internet connection via a dsl line. i am trying to get AD and exchange working on both offices, 1 domain etc. will these routes work

ip route 192.168.2.x(dublin) 255.255.255.0 10.1.1.2 (serial ip)

ip route 0.0.0.0 0.0.0.0 192.168.1.253 (cisco 837 firewall)

will this forward traffic to dublin and forward all other trafic to the internet for email etc???

7 Replies 7

Richard Burts
Hall of Fame Guru Hall of Fame Guru
Hall of Fame Guru

Mike

The routes should do what you need (if certain assumptions we are making are true).

Any packet to a destination on a connected subnet interface will be delivered directly to the interface.

Any packet whose destination is 192.168.2.whatever will be routed to 10.1.1.2 which we assume is the other end of the serial link to Dublin.

Any other packet will be forwarded to 192.168.1.253 where we assume that 192.168.1.253 is a connected subnet and is the address of the outbound 837.

HTH

Rick

HTH

Rick

rick

yes the assumptions u make are correct.thanks for your help. is there anything else i should know for this project. The link is 512 and it is originally to be used to link extensions in dublin to our phone system in cork. would u think it will have enough bandwidth to provide both??about 20 users in dublin

Is this a Cisco voip system or a pbx with ethernet cards ? YOu will need to consider how much bandwidth will be consumed by a single call. YOu will need to calculate busy hour call volume during any business day. Under worst case conditions, if all 20 people make or receive calls, and Voice codec used by the system is g711, you will need 20 * 80 kbps = 1.6 Mbps to support all calls reliably. If using g729 codec instead, you will need 20 * 20 kbps = 400 kbps which is well within the budget. Remember if you are using data over this pipe along with voice, you will need to account for that traffic too. You will need to enable qos over this link, with voice packets being prioritized. There are a bunch of QOS methods that can be implemented to prioritize voice over data. (LLQ for example)

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

im 90% sure its a pbx with ethernet cards. will this be better or worse than the above stats you gave me. the voip is only enabling both offices to call each other using extensions rather than dialing the whole number. not that many calls go between both offices. a telecoms company will be looking after the voice part of it so im sure they will enable qos for reliability. do you know when they configure it for voice will that automatically enable us to be able to ping the appropriate devices there also

The values i mentioned should be pretty much the same for the PBX also.(if using g711 or g729). 1.6Mbps or 400 kbps (for g711 and g729) are worst case conditions, if all the 20 users receive/send calls. So you should be well within budget if using g729 codec and on an average if 10 calls are placed at a single time, only 200 kbps bandwidth will be used.

So is this an IPLC or you are using 3DES or DES IPSEC site to site VPN ?

Check these various links for QOS info

http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094ad2.shtml

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/llqfm.htm

Pinging appropriate devices will be possible once the link is properly setup and routes are properly configured on either end routers. (static or routing protocol)

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

hi

thanks for that. we are using business IP provided by eircom, here is the link

http://mmm.eircom.ie/press/PressRelease_Target.asp?id=186&y=2001&archived=1, it appears to be site to site vpn. would the config for the data be much differnet in this scenario rather than a leased line, would the same routes earlier in the post still apply????

mikeleahy
Beginner
Beginner

even though the routers they wanted to give us originally are netopia routers which arent able to do ipsec 3des so then it cant be a site to site vpn. its really a private vpn external from the internet that used dedicated lines

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