java applets dead slow to load

Fred Schaer fred.schaer at wanadoo.fr
Sat Jun 16 10:14:44 BST 2007


Hi *,

I'm coming back on this thread/subject : I found out what was wrong...
I have setup a firewall using fwbuilder, and it appeared it changes the
IPv6 policy to "drop everything" by default.

Because I'm curious, I changed back those policies to ACCEPT and logged
every packet :

I ran the following :
ip6tables -A INPUT  -i lo  -j LOG --log-prefix "IPv6 LOG INPUT - "
--log-tcp-sequence  --log-tcp-options  --log-ip-options
ip6tables -A INPUT  -i lo  -j ACCEPT
ip6tables -A OUTPUT  -o lo  -j LOG --log-prefix "IPv6 LOG OUTPUT - "
--log-tcp-sequence  --log-tcp-options  --log-ip-options
ip6tables -A OUTPUT  -o lo  -j ACCEPT

I logged this kind of things :

[ 9736.795461] IPv6 LOG OUTPUT - IN= OUT=lo
SRC=0000:0000:0000:0000:0000:0000:0000:0001
DST=0000:0000:0000:0000:0000:0000:0000:0001 LEN=80 TC=0 HOPLIMIT=64
FLOWLBL=0 PROTO=TCP SPT=54837 DPT=56384 SEQ=1258806303 ACK=0
WINDOW=32752 RES=0x00 SYN URGP=0 OPT
(02043FF80402080A002401790000000001030305)
[ 9736.795481] IPv6 LOG INPUT - IN=lo OUT=
MAC=00:00:00:00:00:00:00:00:00:00:00:00:86:dd
SRC=0000:0000:0000:0000:0000:0000:0000:0001
DST=0000:0000:0000:0000:0000:0000:0000:0001 LEN=80 TC=0 HOPLIMIT=64
FLOWLBL=0 PROTO=TCP SPT=54837 DPT=56384 SEQ=1258806303 ACK=0
WINDOW=32752 RES=0x00 SYN URGP=0 OPT
(02043FF80402080A002401790000000001030305)

And the problem disappeared... now, the big question : would one of you
know why java requires IPV6 on an IPV4 network ?
auxiliary question : I'm not a firewall expert, but I don't think what I
did is insecure, is it ?

Cheers

Chris Miller a écrit :
> You need to have the GCJ stuff installed as well.  When Java 6 runs,
> it also uses some linked binaries from GCJ (as far as I can tell from
> HTOP stack traces of Eclipse).  Try installing GCJ, make sure that
> Java 6 is the default, and then try.
>
> HTH.
>
>   




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