Poor performance/packet loss with Cisco 887VA router on ADSL line
We have a remote site connected to ADSL line with a Cisco 887VA router attached. This has been working fine for the last couple of months. However, recently, the site have started to complain of performance issues (network slow, applications disconnecting, etc)
Looking on the router, we can see evidence of packet loss/timeouts from a simple ping to the internet e.g.
ping 22.214.171.124 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 126.96.36.199, timeout is 2 seconds:
However, we have logged the fault with our service provider and they return all line tests as clear but what is particularly strange is that they also report “and the SNR Margins are well within threshold levels (Upstream 11.5 and Downstream 15.0)” which, unless I’m misunderstanding something, seems to be completely different from what the router itself is reporting.
Is there a reason why the service provider’s stats for Noise Margin would appear to be so different from what the router is reporting?
And can anyone suggest any way we might a) identify the root cause of the issue and b) resolve it?
just to update on this one. This has now been resolved after an engineer from the telco visited the site (we are told it was an "exchange fault" but not much more detail than that unfortunately. We did not need to replace our router so it was definitely an issue on the telco side. I believe the reason for the discrepancy between the noise margin reported by the Cisco router and that reported by the service provider was that they ran their diagnostics on the wrong line! (this ADSL line was in our office above the branch - they ran diagnostics against the branch connection)
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