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03.10.2008 at 09:40AM PDT, ID: 23228984
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9.2

VLANS and routing

Asked by nicholsj in Network Routers, Network Switches & Hubs, TCP/IP

Tags: , , ,

Background:

We have 6 sites all connected to a central office via fibre.  All incoming connections come into one layer 3 switch (3com 4050).  There are vlans setup and routing on the switch accordingly (1 IP per site, every sites default router is this switch with the ip from their subnet).

There is one exception... one of the sites comes off of another site(Site A) and does not have a direct link back to this switch.  To get connectivity to this site, fibre is ran from Site A to the other site (Site B).  We have a vlan swich set up at Site B (3com 4500) with 2 vlans one with an IP from Site A, and one from Site B.  The routing table is on the switch at site B and seems to route traffic fine.  The default router for Site B is set to the IP address of the 4500 with the Site B IP, the routing table on the 4050 switch is set to route traffic to Site B via the Site A IP.

All seems to work just fine (internet and network connectivity), and all traffic seems to be routing like it should... except for a few odd things.  I am unable to publish ip addresses from the Site B subnet to the external network.  Our external firewall will not allow incoming traffic (explicitly allowed) to come into the Site B network, and we use a program for our Library system (Follett) that looks up MARC records online.  It will not function on the site B subnet... it says something about the port access not allowed, but i have no deny rules at all on the switch.

I am confused at why most everything works just fine, but these few oddities are giving me problems.  Thanks for any assistance.Start Free Trial
[+][-]03.10.2008 at 12:20PM PDT, ID: 21089397

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[+][-]03.10.2008 at 12:34PM PDT, ID: 21089566

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[+][-]03.10.2008 at 12:38PM PDT, ID: 21089615

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[+][-]03.10.2008 at 12:39PM PDT, ID: 21089623

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[+][-]03.10.2008 at 12:40PM PDT, ID: 21089646

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About this solution

Zones: Network Routers, Network Switches & Hubs, TCP/IP
Tags: Routing, IP, VLAN, Switches
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Solution Provided By: JFrederick29
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03.10.2008 at 12:42PM PDT, ID: 21089655

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[+][-]03.10.2008 at 12:59PM PDT, ID: 21089834

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[+][-]03.10.2008 at 01:17PM PDT, ID: 21089980

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[+][-]03.10.2008 at 01:20PM PDT, ID: 21090007

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[+][-]03.10.2008 at 01:26PM PDT, ID: 21090054

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[+][-]03.10.2008 at 01:35PM PDT, ID: 21090140

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[+][-]03.11.2008 at 05:26AM PDT, ID: 21094964

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[+][-]03.11.2008 at 05:27AM PDT, ID: 21094972

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