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IP-Masq. problem





Hi..

You may remember me.. I asked a while ago about ISPs in Israel.  Well, we
decided to go with Actcom (ADSL connection).  Now I have a interesting
problem with IP masquerading.  First let me say that everything works fine
when connected through Netvision (we still have the account with them).  
Only the username/password has changed on the pptp line.  Now, I'm having
problems getting web pages on the workstations.  (Everything works from
our server.. the one that actually connects to Actcom).  The strange thing
is that I can send packets, ping and telnet to external servers seemingly
without problem.

Attached is a short packet log from the kernel (2.2.13).  Our server has
IP addresses of 192.168.1.1 and 192.117.108.106, as well as others.  The
workstation is 192.168.1.4.  The DNS lookup succeeds (yes I know I'm using
Netvision's DNS), and then 3 or 4 packets are sent to the web server and
the last one is never responded to.  (Yes these are real IP addresses..
don't portscan my machine, it will block you.)

Interesting fact: a small web page with a couple lines of text does load.  
Another from the same server (geocities.com) with 1 image also loads, but
the image doesn't.

Any ideas?  Anyone else have problems with NAT with Actcom?  BTW, I did
call Actcom support.  They had me configure my browser to use their proxy
and it helped but I still can't get Actcom's own web page, for example.

Thanks,
-Cedar


-- Attached file included as plaintext by Listar --
-- File: problem.txt

Jun  7 19:03:12 nanu kernel: Packet log: input - eth0 PROTO=17 192.168.1.4:1031 194.90.1.5:53 L=66 S=0x00 I=18155 F=0x0000 T=64 (#4)
Jun  7 19:03:12 nanu kernel: Packet log: output - ppp0 PROTO=17 192.117.108.106:61268 194.90.1.5:53 L=66 S=0x00 I=18155 F=0x0000 T=63 (#3)
Jun  7 19:03:12 nanu kernel: Packet log: input - ppp0 PROTO=17 194.90.1.5:53 192.117.108.106:61268 L=256 S=0x00 I=32184 F=0x4000 T=249 (#3)
Jun  7 19:03:12 nanu kernel: Packet log: input - eth0 PROTO=6 192.168.1.4:1043 192.114.47.83:80 L=60 S=0x00 I=18156 F=0x4000 T=64 SYN (#4)
Jun  7 19:03:12 nanu kernel: Packet log: output - ppp0 PROTO=6 192.117.108.106:61270 192.114.47.83:80 L=60 S=0x00 I=18156 F=0x4000 T=63 SYN (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - ppp0 PROTO=6 192.114.47.83:80 192.117.108.106:61270 L=60 S=0x00 I=34149 F=0x4000 T=62 (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - eth0 PROTO=6 192.168.1.4:1043 192.114.47.83:80 L=52 S=0x00 I=18157 F=0x4000 T=64 (#4)
Jun  7 19:03:12 nanu kernel: Packet log: output - ppp0 PROTO=6 192.117.108.106:61270 192.114.47.83:80 L=52 S=0x00 I=18157 F=0x4000 T=63 (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - eth0 PROTO=6 192.168.1.4:1043 192.114.47.83:80 L=383 S=0x00 I=18158 F=0x4000 T=64 (#4)
Jun  7 19:03:12 nanu kernel: Packet log: output - ppp0 PROTO=6 192.117.108.106:61270 192.114.47.83:80 L=383 S=0x00 I=18158 F=0x4000 T=63 (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - ppp0 PROTO=6 192.114.47.83:80 192.117.108.106:61270 L=52 S=0x00 I=34184 F=0x4000 T=62 (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - ppp0 PROTO=6 192.114.47.83:80 192.117.108.106:61270 L=641 S=0x00 I=34795 F=0x4000 T=62 (#2)
Jun  7 19:03:12 nanu kernel: Packet log: input - eth0 PROTO=6 192.168.1.4:1043 192.114.47.83:80 L=64 S=0x00 I=18159 F=0x4000 T=64 (#4)
Jun  7 19:03:12 nanu kernel: Packet log: output - ppp0 PROTO=6 192.117.108.106:61270 192.114.47.83:80 L=64 S=0x00 I=18159 F=0x4000 T=63 (#2)

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