linux ppp server SLOW with cisco 801

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I have the following setup


     XXXXXXXXXppp0                              XXXXXXXXXXXXX
     X linux X----------------------------------X cisco 801 X
     XXXXXXXXX192.168.40.1          192.168.40.2XXXXXXXXXXXXX   
   192.168.1.164                                 192.168.5.1

The cisco dials into the linux box and the connection is very slow (for a
dialup). If I ping cisco to linux it gives a 30% packet loss but linux to
cisco gives no packet loss. Telnet linux to cisco is OK but telnet cisco to
linux is very slow. I suspect routing but I can't see any problems. The same
setup works perfectly on SCO 5.0.4 but I don't want to use it on that
server.

routing is setup with ip-up.local on the linux box

Linux is redhat 7.1 with kernel-2.4.2-2 ppp-2.4.0-2 mgetty-1.1.25-5

 netstat -rn on linux
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
192.168.40.2    0.0.0.0         255.255.255.255 UH       40 0          0
ppp0
192.168.5.0     192.168.40.2    255.255.255.0   UG       40 0          0
ppp0
192.168.1.0     0.0.0.0         255.255.255.0   U        40 0          0
eth0
127.0.0.0       0.0.0.0         255.0.0.0       U        40 0          0 lo
0.0.0.0         192.168.1.1     0.0.0.0         UG       40 0          0
eth0

show ip route on the cisco
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
       U - per-user static route, o - ODR, P - periodic downloaded static
route
       T - traffic engineered route

Gateway of last resort is 192.168.40.1 to network 0.0.0.0

     192.168.40.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.40.0/29 is directly connected, Dialer1
C       192.168.40.1/32 is directly connected, Dialer1
C    192.168.5.0/24 is directly connected, Ethernet0
S*   0.0.0.0/0 [1/0] via 192.168.40.1

Any suggestions as to where to start would be appreciated. I can provide
tcpdumps etc.

Stephen Collier
Panavision Australia

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