About Martijn de Loos

Martijn de Loos · 11-02-2018

Hello, I am having an odd problem in a client's network and it is causing big issues. Please see the (simple) star topology below: 5x Cisco Small Business Switch SG220-50 1x Fortinet FortiWifi 60D firewall A whole bunch of desktops and printers and ...

Martijn de Loos · 06-29-2017

Hi, I have been struggling with an issue for the past 2 days and can't figure out what is going on. We are using VoIP phones with an on-premise PBX. Our core switch connected to our Cisco ASA firewall is a Cisco Small Business SG220-26P switch. We h...

Martijn de Loos · 06-26-2016

Hi all, I was wondering if it is possible to configure an ASA5510 in such a way to make it possible for remote access VPN users to use the outside IP address of the ASA when browsing the web. So what I am looking for is a solution to conceal my own ...

Martijn de Loos · 05-06-2016

Hi all, Our company has three branch offices. All these offices have an ASA5510 firewall installed. The three ASA's are sending syslog messages to a syslog server. All three devices are spamming the same "Deny IP spoof" message. Our provider has ass...

Martijn de Loos · 03-24-2016

Hi all, I have a very weird issue with our office ASA. It's a ASA 5510 running on version 9.1.6 (the latest version available for this model). The ASA is configured as router on a stick. The inside Ethernet0/1 interface is divided into multiple sub...

Martijn de Loos · 11-07-2018

Right now all switches are running STP, not RSTP. Its a simple flat network, so no VLANs are present (beside the default VLAN 1). Switches are in a Star setup (see picture in my first post). The reason I set bdpu guard on the switchports is because...

Martijn de Loos · 11-07-2018

Hi Paul, Thanks again for your replies. I will check in the afternoon as I am not in the office right now. Before I left I did see something interesting in the STP port statusses/port roles on the coreswitch. It said the root bridge was connected t...

Martijn de Loos · 11-07-2018

I have been monitoring the network for the past couple of days. We had zero issues for 5 consecutive days, but last night the disruptions to the gateway came back again. With lots of delays and disconnects I was able to connect to the Cisco switches....

Martijn de Loos · 11-05-2018

Thanks. I will check it out if it happens again. The switches are connected to the coreswitch with LACP etherchannels. 2 ports per etherchannel.

Martijn de Loos · 11-05-2018

I did this on one of the servers. It has been running since Friday morning. Had a little over a million pings with 0 packets lost. I will leave it running.The SG switches can do pings but only a maximum of 65535 pings and it is done within a browser ...

Member Since	‎06-03-2013 01:43 AM
Date Last Visited	‎11-16-2018 12:30 PM
Posts	40

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Connection to gateway randomly lost

QoS Tagging SG220-26P Small Business Switch

Using ASA's public IP when browsing the web over remote access vpn

Deny IP Spoof messages in ASA syslog

ASA higher security level traffic unable to flow to lower level security interface

Re: Connection to gateway randomly lost

Re: Connection to gateway randomly lost

Re: Connection to gateway randomly lost

Re: Connection to gateway randomly lost

Re: Connection to gateway randomly lost