How to Update Cisco Router DSL Firmware

A step by step guide on how to update Cisco router DSL firmware. Cisco ISR router DSL firmware can be a source of frustration for ADSL users and is notorious for it’s its poor ADSL 2+ support in older models. Fortunately a firmware upgrade usually sorts this out and addresses the lack of ADSL 2+ support. However unlike your average DSL […]

Troubleshoot Cisco Site-to-Site VPNs

Troubleshoot Cisco Site-to-Site VPNs This article is a how to on troubleshooting a Cisco router site to site VPN that isn’t connecting or isn’t passing traffic. Troubleshooting Cisco site to site VPNs may not seem as straight forward as some other routers or firewalls as we don’t always get a decent GUI with lots of visual feedback telling us our VPN works or doesn’t work. […]

Allow PPTP VPN through Cisco PIX

Allow PPTP VPN through Cisco PIX I came across a situation recently where a customers VPNs wouldn’t connect. This was a straight forward Microsoft PPTP VPN setup but there was no sign of any sessions hitting the RRAS server. The issue was caused by an incorrectly configured Cisco PIX. Here is a short guide to allow PPTP VPN through Cisco PIX: 1. Firstly ensure your access […]

Cisco PIX some hosts get no internet connectivity

Symptoms: Some servers using Cisco PIX as default gateway may lose internet connectivity intermittently or permanently while other servers using the same Cisco PIX as their default gateway don’t. You can ping the gateway from the affected servers but they simply fail to route any further than the PIX. Troubleshooting: Investigate PIX configuration. Considering you would know if anyone had made any firewall configuration changes… hopefully 😉 it is […]