Modem funkiness ... again
Ok.. Debian system, running testing, kernel 2.2.17
For some strange and unknown reason, the great modem slowdown has happened
again.
The machine had been up for close on 12 days - and had been connecting
everywhere without a problem. Today I went to go poll my mail from my windows
machine, and it's running reaaaaaaalllllly slooooowwwwly and then eventually
times out.
Switched ISPs (I keep two accounts with different providers) .. no change this
time.
Rebooted machine.. No change..
One thing I did notice is the MTU seems different depending on whom I dial -
was 1524 one connection, 1500 this connection. Where should the MTU be
specified for a PPP connection? Do I need to adjust ethernet MTU also? What's
MSS (vaguely recall reading something about it and negotiation of MTU).
I also recall reading someone who said that setting MTU around 500 and
something works well on slow dialup links. All that makes me curious is that I
haven't significantly altered my setup for 12 days - why should it start
fscking up now? Duty cycle on modem powerup?
eth0 Link encap:Ethernet HWaddr 00:20:18:8E:7E:E6
inet addr:10.254.254.254 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:401 errors:0 dropped:0 overruns:0 frame:0
TX packets:496 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:11 Base address:0x6000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
ppp0 Link encap:Point-to-Point Protocol
inet addr:(Looks right) P-t-P:(Same here) Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:425 errors:0 dropped:0 overruns:0 frame:0
TX packets:346 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
Using package ipmasq - sets up following:
# ipchains -L
Chain input (policy DENY):
target prot opt source destination ports
ACCEPT all ------ anywhere anywhere n/a
DENY all ----l- 127.0.0.0/8 anywhere n/a
ACCEPT all ------ 10.0.0.0/8 anywhere n/a
DENY all ----l- 10.0.0.0/8 anywhere n/a
ACCEPT all ------ anywhere nas06-003.dialup.vicnet.net.au
n/a
DENY all ----l- anywhere anywhere n/a
Chain forward (policy DENY):
target prot opt source destination ports
MASQ all ------ 10.0.0.0/8 anywhere n/a
DENY all ----l- anywhere anywhere n/a
Chain output (policy DENY):
target prot opt source destination ports
ACCEPT all ------ anywhere anywhere n/a
ACCEPT all ------ anywhere 10.0.0.0/8 n/a
ACCEPT !tcp ------ anywhere BASE-ADDRESS.MCAST.net/4 any ->
any
DENY all ----l- anywhere 10.0.0.0/8 n/a
ACCEPT all ------ nas06-003.dialup.vicnet.net.au anywhere
n/a
DENY all ----l- anywhere anywhere n/a
# ps ax
PID TTY STAT TIME COMMAND
1 ? S 0:13 init [2]
2 ? SW 0:00 [kflushd]
3 ? SW 0:00 [kupdate]
4 ? SW 0:00 [kpiod]
5 ? SW 0:00 [kswapd]
225 ? S 0:00 /sbin/syslogd
227 ? S 0:01 /sbin/klogd
232 ? S 0:00 /usr/sbin/named
240 ? S 0:00 /usr/sbin/dhcpd-2.2.x -q eth0
245 ? S 0:00 /usr/sbin/inetd
324 ? S 0:00 /usr/sbin/sshd
332 ? S 0:00 proftpd (accepting connections)
335 ? S 0:00 /usr/sbin/atd
338 ? S 0:00 /usr/sbin/cron
353 tty1 S 0:00 /sbin/getty 38400 tty1
....
358 tty6 S 0:00 /sbin/getty 38400 tty6
359 ttyS1 S 0:00 /sbin/getty -L ttyS1 9600 vt100
(There's a WY60 terminal in the kitchen :)
365 ? S 0:00 /usr/sbin/sshd
366 pts/0 S 0:00 -bash
370 ttyS0 S 0:00 /usr/sbin/pppd call (profilename)
511 ? S 0:00 /usr/sbin/apache
....
518 ? S 0:00 /usr/sbin/apache
519 ? S 0:00 /usr/sbin/sshd
520 pts/1 S 0:00 -bash
521 pts/1 S 0:00 micq
523 pts/0 S 0:00 bash
771 pts/0 R 0:00 ps ax
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