Scenario: small business with around 40 users behind a Watchguard XTM 3.0 firewall and 20Mb leased line internet connection.
Problem: Users experience occasional dropouts in internet connectivity. These are particularly annoying during VOIP calls eg Skype as connection breaks. Browsing to internet sites is also affected when the dropouts occur. The dropouts are regular enough to be a business problem, though most of the time everything is fine.
Comments: We think the issue is at our end since calls to the same Skype recipients from elsewhere eg home broadband seem to work fine. The problem has also persisted through an upgrade from ADSL to leased line. However we would like to know definitively if the problem is on the LAN or the WAN. Switches are currently unmanaged but shortly to be replaced with new managed switches. The dropouts occur for users anywhere on the LAN as far as we can tell.
Any idea on how to trace the cause of the dropouts? I've wondered if there is a way to test continuity of connection within the XTM? You can see easily that there are no long dropouts but how can we test for short dropouts (but long enough to break a Skype call)?
The more likely reason is something on the LAN - how do we narrow this down without leaving people disconnected for long periods?