Category: Routers

Cisco traffic shaping

There are a few tools to convert Mb to bits, bytes to bits etc, but I like this one – http://www.matisse.net/bitcalc/ Directions are as follows: direction = input or output shaped = Speed you want to traffic shape in bits normal burst = (shaped / 8) * 1.5  extended burst = (normal burst * 2)   …


Mikrotik /ip firewall filter move

Moving a rule in ssh is easy. Just move the rule number to the destination number – /ip firewall filter move 7 destination=4 This would move rule number 7 to position 4, moving 4 lower down the chain. Sometimes helpful when you, like me, accidentally created a rule for winbox 8291 as port 8192!


Mikrotik & dtls Cisco connect vpn slowness

User having slowness when connecting vpn to remote office, plugged into a Mikrotik using sfp1 interface on a 100mbps connection. Speeds on site are fine, no packet loss to remote vpn point, but when connected rdp sessions are extremely slow. Eventually I found a fix for this issue. I changed the wan interface mtu value…


Mikrotik Hairpin NAT

I needed to configure some NAT rules on a Mikrotik, but the rules only worked from outside in. The customer uses split DNS for the domain, so a local address on the mail client, and it needed a loopback rule. In the end I wrote the rules into the router using the terminal, or ssh. Here’s an…


Cisco SNR adjustment

Go into global configuration mode and type the following: service internal int atm 0 dsl noise-margin (a value between -3 and 3) Most likely you will need to increase the SNR for stability. You should check the SNR via the command show dsl interface atm0/0/0 or something like show controllers VDSL 0 (or what ever…


Draytek demo – helpful page

I find this really helpful when I need to look at a Draytek router UI. https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=draytek%20demo   It’s the top link.