Re: Frustration (cablemodem woes)
On Sun, 2001-11-11 at 00:26, Michael Patterson wrote:
> Ok, I'm totally frustrated. To bring anyone who doesn't know up to date:
>
> My previous service was "wantweb". I was given a static IP address, upon
> which I set up a debian (potato) box. I used IP masquerading to connect all
> my windows boxes to it (for game playing, you know).
>
> Now I find that the company is going under. enter the cablemodem. I have
> cablemodem service with Adelphia cable. ( @home). it works beautifully when
> I hook up a single windows machine to it, using DHCP.
>
> When I hook up my linux box to it, I get terrible performance, and
> eventually my connection to the cablemodem fails. I can get the connection
> back by powercycling the cablemodem. I'm using dhcp-client.
>
> DHCP appears to be working find after changing my /etc/networks/interface
> to:
>
> iface eth0 inet dhcp
> hostname "****"
> leasehours 1
> leasetime 3600
>
>
> ifconfig verifies that I have an IP address, etc. (and, as I said earlier,
> the connection works fine, but with poor performance, and eventually
> dropping.) When the connection stops working, ifconfig reports the same IP,
> etc, but starts reporting drops.
>
> switchig to a static address, using what DHCP gave me still gives the same
> results.
>
>
> I'm finding this EXTREMELY difficult to debug, since it isn't an out-and-out
> failure. The cablemodem howto isn't much help, either. Any help would be
> appreciated.
>
> --Mike
Do you have a firewall in place? I found out about two issues in my
struggles.
I found that without /proc/sys/net/ipv4/dynaddr set to 1 my second and
future dhcp requests would try and go out the eth1 static internal card
which was being blocked from sent by my firewall (source<=>adaptor
anti-spoofing rules etc).
I also found that my cable modem keeps sending me IGMP multicast packets
that if I blocked the service would get flaky, at least as far as I
recall. Albiet that this was with pump that had it's own set of
problems but I have charter @home working "almost perfectly" with
dhcp-client. My current setup still requires rebooting the modem (and
perhaps not the pc next time, have to try that) on occassion but
otherwise works very well.
--mike
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