PPP Slowness on interal modem.!

PPP Slowness on interal modem.!

Post by Joe Duham » Fri, 06 Sep 1996 04:00:00



Hi,

I'm having a lot of problems with kernel 2.0.17 and pppd. I have
a 288 modem but I'm only getting 600 cps through put in linux. When
I go to windows I consitently get 2.4 k/s What should I be looking at?
I can see through the message log that I connect at 28800.

        Thanks  for any Help.!!!

        Joe

--
The human mind ordinarily operates at only ten percent of its capacity
-- the rest is overhead for the operating system.

 
 
 

PPP Slowness on interal modem.!

Post by Arndt Brensche » Fri, 06 Sep 1996 04:00:00



>I'm having a lot of problems with kernel 2.0.17 and pppd. I have
>a 288 modem but I'm only getting 600 cps through put in linux. When
>I go to windows I consitently get 2.4 k/s What should I be looking at?
>I can see through the message log that I connect at 28800.

Sounds like your serial line is at 9600 baud ? This together with the
default asyncmap would yield about 600 cps.

The connect message '28800' refers to the phone-side of the modem,
not the computer side.

Your /etc/ppp/options file should look more or less like:

/dev/ttyS1 38400 crtscts defaultroute asyncmap a0000 lock

hope this helps,

====================================================================

Arndt Brenschede, Dipl.-Phys.

II. Physikalisches Institut der Uni Giessen
Heinrich-Buff-Ring 16, 25392 Giessen

Tel (49)-0-641-702-2786 (priv (49)-0-641-29997 )
Fax (49)-0-641-74390


====================================================================

 
 
 

1. Help Interal routing, IP Masq, PPP

I need a hand with my home network.

Two Linux boxes, "desktop" and "notey". They are both connected via ethernet and
a hub on an internal network 192.168.50.2 and 192.168.50.1.

"notey" also has a modem which dials into either work or local ISP, so its PPP
interface address changes. It is running IP Masquerading to "desktop". It is
also the DNS server for my internal network.

When I connect "notey" to another network via PPP, it comes up fine; both
"notey" and "desktop" can talk to the external network just fine.

"desktop" can telnet/ftp/ping/nslookup to notey, and, via Masq. to the world.

The problem is that "notey" can't telnet/ftp/ping back to "desktop" since there
is no route there. It passes the Masq. packets back ok, but no direct TCP
connection from "notey" to "desktop". The other way works fine.

I think this is because the default gw on "notey" is the PPP interface in the
other, external, network; and this knows nothing of "desktop" in my private
network, on eth0.

I've tried adding routes with /sbin/route add -net but I don't understand it
enough to make it go.  

How do I add a route to "notey" so that it can talk back to "desktop"?
(bonus question: how come "notey" can answer "desktop"'s DNS questions with my
current setup, it cant be using TCP, can it?)

Current routing table on "notey" is:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
158.64.6.114    0.0.0.0         255.255.255.255 UH      552 0          0 ppp0
192.168.0.0     0.0.0.0         255.255.0.0     U      1500 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U      3584 0          0 lo
0.0.0.0         158.64.6.114    0.0.0.0         UG      552 0          0 ppp01  

Thank you very much for any advice you can give me. Please note that I am dumb
and will need the answer spelt out in detail. Thanks again.

George.

--  

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