mtu 1492 inet 61.170.151.96 --> 1.1.1.1 netmask 0xffffffff Opened by PID 163 Regards Fred Zhang ------=_NextPart_000_0065_01C1FD93.8843D050 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

Can I ask you a question;

The machine behind the gateway can = access the=20 outside by ftp, httpd etc.
But they cannot receive mails from some = mail=20 servers by pop3.

When the tun0 is bring up by default, = its mtu is=20 set to 1500, at this time even in the gateway they cannot receive mails = by=20 fetchmail.
The username/password anth is passed, but the fetchmail = hangs up=20 while retriving mails, at last throw a timesout error.

But when the mtu of tun0 is set to = 1492, they can=20 retrives mails from the mailserver(see below), But they cannot retrive = mails=20 from the outlook express on windows behind the gateway.
The = username/password=20 anth is passed in outllook express, but it hangup while retriving mails, = at last=20 throw a timesout error(see below).

plus.

The OS is FREEBSD 5.0 DP-1

------------------Messages about = fetchmails=20 ------------------
Enter password for jerry@timogen.com@pop3= .timogen.com:
3=20 messages for jerry@timogen.com = at=20 pop3.timogen.com (18332 octets).
reading message jerry@timogen.com@po= p3.timogen.com:1=20 of 3 (10630 octets) .......... flushed
reading message jerry@timogen.com@po= p3.timogen.com:2=20 of 3 (4636 octets) .... flushed
reading message jerry@timogen.com@po= p3.timogen.com:3=20 of 3 (3066 octets) ... flushed

------------------Error of outlook express=20 ------------------
A time-out occurred while communicating with the = server.=20 Account: 'jerry.timogen.com', Server: 'pop3.timogen.com', Protocol: = POP3, Port:=20 110, Secure(SSL): No, Error Number: 0x800CCC19

------------------the ifconfig messages = ------------------

rl0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu = 1500
        inet 0.0.0.0 netmask=20 0xffffff00 broadcast = 0.0.0.255
       =20 inet6 fe80::240:b8ff:fe50:3ab2%rl0 prefixlen 64 scopeid=20 0x1
        ether=20 00:40:b8:50:3a:b2
        media: = Ethernet=20 autoselect (none)
        status:=20 active
rl1: = flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu=20 1500
        inet 192.168.5.99 = netmask=20 0xffffff00 broadcast = 192.168.5.255
       =20 inet6 fe80::240:b8ff:fe50:1860%rl1 prefixlen 64 scopeid=20 0x2
        ether=20 00:40:b8:50:18:60
        media: = Ethernet=20 autoselect (100baseTX=20 <full-duplex>)
        = status:=20 active
lp0: flags=3D8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu = 1500
lo0:=20 flags=3D8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu=20 16384
        inet6 ::1 prefixlen=20 128
        inet6 fe80::1%lo0 = prefixlen 64=20 scopeid 0x4
        inet 127.0.0.1 = netmask=20 0xff000000
ppp0: flags=3D8010<POINTOPOINT,MULTICAST> mtu = 1500
tun0:=20 flags=3D8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu=20 1492
        inet 61.170.151.96 = -->=20 1.1.1.1 netmask 0xffffffff
        = Opened=20 by PID 163

Regards
Fred = Zhang

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