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RV082-with traffic shaping-computers simultaneously lose connection to internet for a while

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by 123bg, Jun 9, 2007.

  1. 123bg

    123bg LI Guru Member

    We have an RV082 for 2 weeks, firmware 1.3.5 and we connect about 50 computers behind it. But computers just simultaneously lose connection to internet for a while.
    When I disable traffic shaping - no problems.But with traffic shaping enabled the problems ocures again and again.
    The main purpose we use the router is for firewall and traffic shaping. So I need that traffic shaping.We don't use DHCP.
    We have one ADSL 4Mb connection wich I have to divide to that 50 client computers.
    In "Bandwith management" I use Rate Control and for every client IP address I set different rule for Minimum Rate and Maximum Rate for both upstream and downstream bandwidth.For example 384kbps/64kbps downstream/upstream for everi internal IP.
    I did several changes to cure the problem as MTU change, reset and reconfigure and etc. but still computers just simultaneously lose connection to internet for a while( downloads stop at 0 kbps, browsers are slower or stop responding...).
    The problem is not from the Internet provider, but from the router.
    Please help
     
  2. d__l

    d__l Network Guru Member

    Is it possible that when the computers lose the connection to the internet that the total minimum bandwidth allocated by priority control for all those computers is exceeding the available bandwidth for your ADSL line? Available bandwidth is the net bandwidth after the ADSL overhead is factored in.

    4 mbps probably gives about 3.4 mbps after overhead is considered which isn't a lot of bandwidth to divide up among 50 or even 10 computers at once.
     
  3. 123bg

    123bg LI Guru Member

    Thank you for reply. Yes that sounds reasonable. It really happens when I load up the line with downloads from several computers simultaneously.
    So may be I should allocate minimum bandwidth by IP more accurately.
    The bandwidth for my ADSL line is 4096kbps/512kbps.
    How you think, what is the best way to divide the bandwidth by IP of internal computers. If I just allocate the bandwidth uniformly it gives per IP something like 80/10kbps that is realy not enough. Maybe I should put that 80/10kbps as minimal bandwidth downstream/upstream for everi internal IP, and to give 384kbps/64kbps as maximum . How you think will that work correctly?
    Should I put the exact 4096/512kbps for "The Maximum bandwith provided by ISP". Or I can put bigger just to cheat the minimum bandwith restrictions by every internal IP?
    For every IP I have to make separate rule( row) , right?
    Thank you in advance
     
  4. d__l

    d__l Network Guru Member

    I'm not certain that you can use the full sync speeds of 4096/512 for the max bandwidth of the ISP. I don't on my RV082. On ADSL you don't have throughput speeds equal to sync speeds due to the added overheads of ATM, PPPoE encapsulation, etc. So I've reduced the bandwidth settings to the maximum throughputs that I see on local speed tests oover my ISP's network. For my ADSL, the throughput speed is only about 85% (at best) of my sync speeds.

    If you have similar overheads, your throughputs would only be ~3480/435 and I think those should be the max bandwith settings you should use. You could try them as an experiment to see if this helps the problem.

    If you expect all 50 computers to be using the internet bandwidth at once, then I think you would have to divide that max bandwidth by 50 for the minimum settings which of course isn't very much bandwidth per computer!

    Do you want all computers to have equal bandwidth or should some be more favored than others? If some should be more favored than others, then there are ways to do that. Some other router brands that are more expensive allow you to group the various computers attached to it and then assign a pool of bandwidth to each group. Then the computers within each bandwidth pool would have to share that available bandwidth. The bandwidth pools for each group can be of varying amounts, so say the computers in the research group would get 1000 kbps of bandwidth, but the marketing pool only 500 kbps. It isn't as easy to do this on an RV082, but you can segment your internal IP range into various groups and then allocate the bandwidth into pools by IP range rather than specific IP. This way the computers within an IP range could have a higher minimum bandwidth, but then the other computers within other ranges must have their minimum bandwidths lowered to compensate.

    I think your main problem ultimately boils down to insufficient total bandwidth to service all or most of your computers at once.
     
  5. 123bg

    123bg LI Guru Member

    Thank you,
    You are right, grouping of computers by IP range, and ~3480/435 for max bandwith settings is good solution. I will try it on monday at work.
     

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