Routing/Firewall/VPN Problems UC540 CCA 2.2(1)

Unanswered Question
Jan 5th, 2010
User Badges:

I'm having a bear getting the firewall configured right...There is very little control over the config.

Connection is DHCP (ISP provides a new IP address every 18 months or so but without DHCP request, no routing...)

DDNS works but address doesn't resolve properly when requests come from inside...

for example: is nat'd to for svn access

Outside the office, works fine but inside the office it does not.

This breaks the app because it sees and as different hosts

Likewise, I cannot configure or use the VPN on DDNS...worked fine on the RVL200 we replaced but once I turn on DHCP, the other settings are lost..

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Steven Smith Tue, 01/05/2010 - 14:06
User Badges:
  • Gold, 750 points or more

On the local host issues with, what is the dns server?  Is it an outbound DNS server?  I believe you can hairpin the traffic on the UC540 so that the application only thinks it is using the WAN address.

What type of VPN are you using?  I don't believe EZVPN has a requirement of a static IP, but the SSL VPN does.

ambleside Tue, 01/05/2010 - 14:13
User Badges:

DNS server is google do I hairpin the traffic...that's exactly what I'm trying to do..

Yes, EZ VPN works ok...SSL VPN is required for the 525G phones....

ambleside Tue, 01/05/2010 - 14:36
User Badges:

There really aren't any rules to speak ip, internal port, external port...that's it.


This Discussion