Monday, January 11, 2010

Blog moved to

I've moved my blog to here. Thank you


Saturday, January 9, 2010

Can firewall or router modify data?

I’ve heard someone saying that firewall corrupted a file sent by FTP and they have to deliver it on tapes… so can firewall or router modify/change data ? Cisco Flexible Packet Matching (FPM) can match every bit of the payload but cannot modify it. So it’s not possible to configure per say a substitute regex. But Firewall or IOS packet inspection feature can drop certain packets not compliant with corresponding RFC.