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Upload Speed Very Slow

PADDY27

Hi,

I've installed a Sophos SG210 to NTU (Cisco ME3400e) fiber 100Mb/100Mb connection. I get around 68Mb download but only 3Mb upload. I connected my laptop directly to the NTU and getting around 80Mb/80Mb. What would be the problem?

Things I tested:

1. Cable check

2. Disabled IPS & Web filtering and only keep the basic network settings.

 

One thing I notice is that Sophos WAN port (eth1) showing a lot of errors and collisions. It seems it is because of the half duplex. Would this be the issue why I am getting 3Mb upload speed? If I manually change the duplex mode to full, then the link goes down. I cannot check the other side of the port as it is managed by ISP.

eth1   Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
          inet addr:110.xxx.xxx.xxx Bcast:110.xxx.xxx.xxx Mask:255.255.255.252
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:373271 errors:0 dropped:0 overruns:0 frame:0
          TX packets:220080 errors:2306 dropped:0 overruns:0 carrier:2306
          collisions:128842 txqueuelen:1000
          RX bytes:527821557 (503.3 Mb) TX bytes:48346583 (46.1 Mb)

ethtool eth1
Settings for eth1:
        Supported ports: [ TP ]
        Supported link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Advertised link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Half
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                              drv probe link
        Link detected: yes



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  • 0

    One big problem is caused by the high amount of collisions.

    Would it be possible to place a switch between the SG and the NTU? Maybe a managed one to get some diagnostic data.

    Best

    Alex

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  • 0 in reply to Alexander Busch

    One idea to add, could you try an other Ethernet port of the SG instead of eth1?

    -

  • 0

    Half-duplex is old technology.   Anything that runs at 100Mbs should be running full-duplex.   

    Unfortunately, Auto-detect works for speed but not for duplex, so your symptoms almost certainly mean that one side is set for Auto-detect and the other side is set for 100-Full.   The auto-detect side will configure to 100-Half, and you will have poor performance.   

    Check with your ISP.   Acceptable settings are Auto on both sides or 100-Full on both sides, but you cannot mix the two.  Match the two and the errors will go away.   Once the errors are gone, you can get a realistic test.

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