RX packet errors

[tino85]

Hello,

I am getting a lot of RX errors in my server and the network connection is very low, around 6kB/s. I am giving the NIC details below.

The eth0 is the onboard NIC, its a RTL8201EL. That NIC is a 10/100 NIC. The cable is about 250m long and it cat 6e. It connects a Juniper ex3200 to a Netgear 108E (link at 1gb) and then from the netgear to the server. Our network admin told me that he did test the cable and and it did not give any errors.

==============================================
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:577829 errors:29547 dropped:0 overruns:0 frame:29547
TX packets:241600 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:221283920 (211.0 MiB) TX bytes:36979981 (35.2 MiB)
Interrupt:27 Base address:0xc000
===============================================


NIC statistics:
tx_bytes: 36978307
tx_zero_rexmt: 241593
tx_one_rexmt: 0
tx_many_rexmt: 0
tx_late_collision: 0
tx_fifo_errors: 0
tx_carrier_errors: 0
tx_excess_deferral: 0
tx_retry_error: 0
rx_frame_error: 0
rx_extra_byte: 0
rx_late_collision: 0
rx_runt: 0
rx_frame_too_long: 0
rx_over_errors: 29547
rx_crc_errors: 0
rx_frame_align_error: 0
rx_length_error: 0
rx_unicast: 236803
rx_multicast: 25263
rx_broadcast: 314892
rx_packets: 576958
rx_errors_total: 29547
tx_errors_total: 0
tx_deferral: 0
tx_packets: 241593
rx_bytes: 268335775
tx_pause: 95623
rx_pause: 0
rx_drop_frame: 579
tx_unicast: 874976
tx_multicast: 321584
tx_broadcast: 1065645641612

Can anybody please help me to find the root cause of this issue.
Thanks

[Irithori]

250m is way outside the specs.
Afaik 100m is maximum and even then lower throughput is expected.

[Lazydog]

Anything over 100m is definitively not supported. Are you sure it is 250m and not 250ft?
I also question how your network admin could check such a long cable and tell you it is fine.

[scheidel21]

Not adding much here, but if it's really 250m then you are exceeding spec by 2.5 times, if the cable is really that long the only way to fix this is to place signal regenerators (or a small switch or hub) no more than at 100m intervals, so essentially you would need 2 in a run of 250m.