Good day, Joshua,
On Fri, 26 Jun 1998, Joshua Heling wrote:
> I have a persistent problem at a site that's masquerading a 5-node
> LAN through a linux box running 2.0.34 with ppp 2.2.0f and an
> external ISDN TA.
>
> The connection is established just fine, and works. However, when
> used from one of the inside machines, it will work for a short
> amount of time (<5 minutes; usually only 1-2 min.) and then dies
> with:
>
> Jun 25 16:03:45 foo pppd[1713]: Excessive lack of response to LCP
> echo frames.
> Jun 25 16:03:46 foo pppd[1713]: Hangup (SIGHUP)
> Jun 25 16:03:46 foo pppd[1713]: Modem hangup
> Jun 25 16:03:46 foo pppd[1713]: Connection terminated.
> Jun 25 16:03:46 foo pppd[1713]: Exit.
>
> [snip]
The problem is not in ip masquerading, I think. It's in pppd.
Your pppd is asking the other end to reply with LCP (link control
protocol) echoes; the lower level equivalent to ICMP pings. The other end
doesn't respond - this might be a protocol violation, but that's not the
real issue.
The way around it is to tell your end to stop asking for lcp
echoes. From "man ppp":
lcp-echo-failure n
If this option is given, pppd will presume the peer
to be dead if n LCP echo-requests are sent without
receiving a valid LCP echo-reply. If this happens,
pppd will terminate the connection. Use of this
option requires a non-zero value for the lcp-echo-
interval parameter. This option can be used to
enable pppd to terminate after the physical connec-
tion has been broken (e.g., the modem has hung up)
in situations where no hardware modem control lines
are available.
lcp-echo-interval n
If this option is given, pppd will send an LCP
echo-request frame to the peer every n seconds.
Normally the peer should respond to the echo-
request by sending an echo-reply. This option can
be used with the lcp-echo-failure option to detect
that the peer is no longer connected.
I suspect that putting the following lines into /etc/ppp/options
will stop your problem:
lcp-echo-failure 0
lcp-echo-interval 0
Best of luck. Cheers,
- Bill
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Unix _is_ user friendly. It's just very selective about who its friends
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William Stearns ([EMAIL PROTECTED])
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