up vote 0 down vote favorite
share [g+] share [fb]

We have a 100Mb Ethernet circuit connecting 2 sites. I bought 2 Vigor 2920 routers to sit at each end of the circuit to provide basic routing between the sites. I am experienced in configuring routers, such as Allied Telesis and Cisco, but cannot get these two devices to provide effective routing. For example, if I try to ping from a device on one subnet across the Vigor routers to the other subnet I get no response. However, I can ping the other router's WAN port successfully. This lack of connectivity/communication is true for other traffic types. It would seem traffic doesn't know how to get back to the originating subnet, but I have ensured all settings are correct.

Setup as follows:-

Router 1 LAN 1: 192.168.31.3/24 WAN 1: 192.168.52.1/24, GW: 192.168.52.2

Router 2 LAN 1: 192.168.34.1/24 WAN 1: 192.168.52.2/24 GW: 192.168.52.1

Can anyone offer any words of advice?

link|improve this question
Okay you have 100MB line but what kind of line? Is it a public MIS T1/3 that you are also using for Internet access? Is this a standard cable/Adsl line with an IPSEC tunnel? Is this a direct connection (as in a fiber/copper run direct to the other router)? How are your routes setup? Do you use the same gateway for public and private routing (internet and LAN communications)? You say your experienced setting it up but you give no info other than subnets. What have done so far? Do you have RIP setup? are you running proxy or gratuitous ARP? How does traffic know where to go? – Kyle Nov 4 '11 at 14:08
Hi Kyle. It's a private leased line, point-to-point, no VPN involved. I have configured a static route setup on each router corresponding to the other subnet (although the way these Draytek'w work is by setting 0.0.0.0 to its WAN anyway). Devices at each end have the appropriate GW settings and static route also. RIP is not setup. I am not asking a lot of these devices, this very basic stuff. I have no experience of advanced setups. The current routers have the most basic config imaginable and they work just fine, but they cannot handle the 100Mb speed, they max out around 40Mb. – Symon Nov 4 '11 at 14:23
Hmm odd I figured it was an issue with how your routes were setup... 0.0.0.0 to the wan interface is exactly how this should be setup if you don't have a separate router for Internet access or a Tunnel. Have you tried running wire shark on the edge device? Check packet headers and make sure they are destined for the right locations. Also is there any other network devices you can think of that would be causing issues? The routers are your edge device I assume? No Accelerators or De-duplicators? – Kyle Nov 4 '11 at 14:42
Yes, I agree, I suspected it might be my routes, but they all 'seem' to check out. I have not tried Wire Shark. The Draytek routers are acting as the edge devices (they are to replace Allied Telesyn AR410 boxes). There are no other devices involved. I am currently running them in a test environment (no point putting these into production if they won't function correctly!), where I have the following config: PC<>Draytek<>Switch<>Draytek<>PC. This test setup has worked well with the Allied Telesyn and Cisco routers. I'm perhaps making a complete school boy error, so be blunt with me! – Symon Nov 4 '11 at 15:00
Well generally networks are setup: PC<>switch<>router<>router<>switch<>PC The switch operates at layer 2 and the routers at layer 3 and the PC's NIC is layer 1. While there are some exceptions to this you shouldn't have a switch between the two routers unless you are doing Vlan without a Layer 3 switch. Also It's suggested to use cross over cables while connecting switches to routers. Alot of ports will auto configure MDI/MDIX but I have personally had issues with auto negotiation on lower end switches. Any chance you have a powerconnect 2848? – Kyle Nov 4 '11 at 15:12
show 3 more comments
feedback

Know someone who can answer? Share a link to this question via email, Google+, Twitter, or Facebook.

Your Answer

 
or
required, but never shown
discard

Browse other questions tagged or ask your own question.