Re: Checking internet connection without a winbox

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On 03/07/06, Les Mikesell <lesmikesell@xxxxxxxxx> wrote:
> Up until here, everything is clear. I also agree that the router
> shouldn't be droping packets.

Where is 'here'?  If you run traceroute you should see
each hop separately.

'Here' is up until this point in the letter :)
The rest gets confusing.

I took your '1.5Mbs' connection to mean a T1 which would normally
be an interface directly on a router.  If you have a separate
modem, perhaps you have DSL instead.  Anyway, wiring problems
are rare but possible.  More likely is a duplex mismatch where
one end is set to full duplex and one to half.  Check that on
both the router and PC first. On the linux side, ifconfig will
show errors and total transmits/receives but you have to do some
math to compute bandwidth or you can run something like gkrellm
to show it as a graph.  mii-tool or ethtool will show the
speed and duplex settings.

I'm on a cable connection. Cable Coming Into House Through Hole In
Wall -> Modem -> Router -> Linbox.

I'll look into the duplex problem, but where do I start? I did a bit
of googling but I apparently don't know which keywords to google. How
can I check linux's duplex setting, and how can I check the routers?
Here, this may help:
$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:C1:26:02:91:50
         inet addr:  Bcast:  Mask:
         inet6 addr: fe80::2c1:26ff:fe02:9150/64 Scope:Link
         RX packets:90596 errors:0 dropped:0 overruns:0 frame:0
         TX packets:82693 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:88603039 (84.4 MiB)  TX bytes:12217393 (11.6 MiB)
         Interrupt:11 Base address:0xf00

lo        Link encap:Local Loopback
         inet addr:  Mask:
         inet6 addr: ::1/128 Scope:Host
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:24 errors:0 dropped:0 overruns:0 frame:0
         TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:1532 (1.4 KiB)  TX bytes:1532 (1.4 KiB)

Did you do a 'yum update' immediately after the install?  And if
you have ssh enabled and reachable from inbound connections, do
you have a complex password that would be difficult to guess?

The machine is completly up-to-date.

Try to find something that shows traffic and errors on the router
side.  And if the errors are on the next hop out past the router,
report that to your isp.

Wouldn't mtr do that? But I need to correct or eliminate the router first.

Dotan Cohen

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