dmz host problems

By biged_ny ยท 5 replies
Jul 13, 2005
  1. when using dmz host on my router, my computer speeds drop from about 6000kbps to 1000 kbps. anyone have an idea as to why? the tech support people at linksys cant figure it out.
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    Most likely your software firewall can't take the load.

    DMZ means that all the incoming connections end up on your computer and if you are running some bells and whistles behemoth like ZoneAlarm or Norton then it will eat up a big chunk of your CPU cycles.

    What firewall software do you have there? Make sure you don't have two of them running. Also, try uninstalling all other network filters like VPN or packet capture.
  3. biged_ny

    biged_ny TS Rookie Topic Starter

    dmz hosting issue reply

    I am running windowsXP home edition SP2 firewall. That is the only software firewall i am using.
  4. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    OK. Turn the Windows firewall off for a minute? Only do this if you have a fully patched Windows installation and only for the time it takes to test the speed.

    What speeds are we talking about here? Did you use an online speed test or are we talking about some specific program?

    If you have a cable connection then your upload speed is on the expense of your download speed.

    Also, check the process list and sort it by the CPU usage to see anything there that may be the bottleneck.
  5. biged_ny

    biged_ny TS Rookie Topic Starter

    Already tried with windowsXP firewall and Mcafee antivirus completely turned off.
    Ran windows update last week, it is up to date.

    Flashed router with latest firmware release.

    Normal speeds are [via dsl report speed test, 5700-6500kbps download and 900-925kbps upload.] Also ran a download test from my isps ftp site and got average of 770KB/sec x 8=6160kbps.

    WITH DMZ HOST ENABLED- speeds reduce to 725kbps-1000kbps on dsl reports and 350-425kbps for upload.

    Below are my RWIN settings set up for broadband, and also a tweak test result from dsl reports.

    Receive Window (RWIN): 131070
    Window Scaling: 1
    Path MTU Discovery: OFF
    RFC1323 Window Scaling: ON
    RFC1323 Time Stamping: OFF
    Selective Acks: ON
    MSS requested: 1460
    TTL: unknown
    TTL remaining: 114

    2. Test 146000 byte download
    Actual data bytes sent: 146000
    Actual data packets: 100
    Max packet sent (MTU): 1500
    Max packet recd (MTU): 1500
    Retransmitted data packets: 0
    sacks you sent: 0
    pushed data pkts: 3
    data transmit time: 0.316 secs
    our max idletime: 34.1 ms
    transfer rate: 304624 bytes/sec
    transfer rate: 2436 kbits/sec
    This is not a speed test!
    transfer efficiency: 100%

    3. ICMP (ping) check
    Target unpingable

    Notes and recommendations:
    RWIN is in range
    Looking good

    Notes and recommendations:
    Good data stream (no/few rexmits)

    Notes and recommendations:
    Become pingable
    if you need basic packet loss tests done
    Check tweak FAQ
  6. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    We can also assume that you have a ****ty router..

    Test the connection speeds using a CD Linux? If you have the same problem with Linux then you should look over your router settings. Maybe disable some functions like packet filtering. Or maybe enable intrusion detection to drop bad connections right away.
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