I am having link saturation problems with a network consisting of the following in two locations :
Adtran TA600 Series passing data off via V.34 to Adtran Netvanta
3305s. The circuits are provided by the same CLEC at both sites, with average latency of 8-10ms between the links.The units include the optional VPN modules, QOS is setup, and we are carrying voice traffic across the VPN. The commands applicable to carrying traffic out of order (to insure QOS) across the vpn have been issued.
All equipment is running the most recent firmware releases from Adtran.
The problem is simple but difficult at the same time. The circuits are used for internal web browsing, external hosting (email, web, dns, etc), and also our VPN and latency sensitive voice traffic. The links are easily saturated by a user downloading a file from the internet, preventing QOS and killing the ability to carry reliable voice across the links. Looking through the Adtran documentation and in repeatedly talking to Adtran about the problem there doesn't seem to be a simple rate-limiting feature that I can find in the product to prevent link saturation, call it really basic traffic shaping.
I love the reliability of these appliances and do not want to replace them if I can avoid it. Because of the way the network is configured, using one ethernet interface on the 3305 for our private network (NAT) and another for the public segment (public IPs issued to equipment, with firewall filtering done by the 3305), it makes it difficult to add another device in between the network and the device - simply because there are really two networks involved. It would be very difficult to restructure this because of all the equipment running on the public segment.
What am I missing on the Adtran side - any suggestions if I'm not missing anything, perhaps a comparable Cisco product that supports traffic shaping, a serial v.35 interface, and two ethernet interfaces that could be directly dropped in place of my Adtrans?