trouble with masquerade

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hello,
i have a big problem with my router.

i installed a dsl-card into my linux-box and got the router to run. i 
use nat with masquerading like that:
# iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE

all is wonderfully and i can access most of the sites / services..
.but only most.

i have many trouble with one big web page (gmx.de). i tryed to access this
page once from my router and from my masqueraded client. i got two statements.
on means that i can access the other means i can not.

this is my router:
traceroute to www.gmx.de (213.165.65.100), 30 hops max, 40 byte packets
 1  217.5.98.178 (217.5.98.178)  51.24 ms  51.194 ms  78.382 ms
 2  217.237.157.130 (217.237.157.130)  49.83 ms  50.141 ms  49.827 ms
 3  INXS-gw20.M.net.DTAG.DE (194.25.6.14)  61.395 ms  59.688 ms  59.583 ms
 4  62.156.128.226 (62.156.128.226)  57.412 ms  57.86 ms  56.333 ms
 5  www.gmx.net (213.165.65.100)  60.417 ms  60.223 ms  61.81 ms

this my client: (i've translated the statements, because i get a german
                 output here)
Routenverfolgung zu www.gmx.net [213.165.65.100]  über maximal 30 Abschnitte:
  1    10 ms   <10 ms   <10 ms  xerxes.home [192.168.0.1]
  2    50 ms    70 ms    50 ms  217.5.98.178
  3    60 ms    61 ms    50 ms  217.237.157.130
  4    60 ms    80 ms    70 ms  INXS-gw20.M.net.DTAG.DE [194.25.6.14]
  5     *        *        *     out of time.
  6  62.156.128.226  meldet (report): Network is unreachable.

may it be that the network (gmx.de) is masqueraded, too. and this is the
reason of unreachable??

please help.

thanks





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