Safari & Mozilla (et toute connexion à Internet en général) sont
affreusement LENTS !!! L'affichage des pages prend plusieurs secondes
(entre 5 et 10).
Est-ce dû à des préférences que je n'aurais pas virées ?
Pour info, je suis en DHCP pour la connexion Internet via l'Ethernet
intégré. Je précise que c'est du DHCP car le routeur/hub utilisé (un
Phillips CPWBS154) sert aussi à la TV sur ADSL. A noter que cette
connexion télé est éteinte alors que je constate les problèmes de
lenteur ...
J'ai mis les deux antennes de la station en opposition de phase,
c'est-à-dire qu'elles sont couchées et se "regardent" l'une l'autre;
ceci afin d'atténuer le signal émis et reçu ... et éviter ainsi un
éventuel piratage de la liaison Wi-Fi.
Le download de fichiers s'effectue à une vitesse normale pour ma
connexion (3Mbits/s), ce qui me fait penser que je ne suis pas piraté...
J'ai téléphoné au HelpDesk de Belgacom, l'opérateur belge. La ligne est
parfaite; le rapport signal sur bruit est excellent.
J'ai rebranché mon vieux 7500, la liaison est aussi rapide qu'elle
l'était auparavant, les pages s'affichent rapidement.
A priori il n'y a pas d'erreur de transfert / collision de paquets.
La seule conclusion envisageable (à mes yeux) est une configuration
inappropriée de l'iMacG5
Si vous avez des suggestions , n'hésitez-pas ! ... :-)
Thierry
PS : voici les résultats de NetStat suivis des résultats de 10 pings à
www.apple.com
tcp:
6755 packets sent
798 data packets (77504 bytes)
0 data packets (0 bytes) retransmitted
0 resends initiated by MTU discovery
4364 ack-only packets (3294 delayed)
0 URG only packets
0 window probe packets
795 window update packets
798 control packets
9897 packets received
1849 acks (for 78243 bytes)
348 duplicate acks
0 acks for unsent data
8544 packets (9958668 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
20 out-of-order packets (24345 bytes)
0 packets (0 bytes) of data after window
0 window probes
0 window update packets
1 packet received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
274 connection requests
255 connection accepts
0 bad connection attempts
0 listen queue overflows
528 connections established (including accepts)
524 connections closed (including 1 drop)
1 connection updated cached RTT on close
1 connection updated cached RTT variance on close
0 connections updated cached ssthresh on close
0 embryonic connections dropped
1849 segments updated rtt (of 1851 attempts)
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 connections dropped by persist timeout
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
11 correct ACK header predictions
7421 correct data packet header predictions
udp:
172 datagrams received
0 with incomplete header
0 with bad data length field
0 with bad checksum
0 dropped due to no socket
0 broadcast/multicast datagrams dropped due to no socket
0 dropped due to full socket buffers
0 not for hashed pcb
172 delivered
233 datagrams output
ip:
10069 total packets received
0 bad header checksums
0 with size smaller than minimum
0 with data size < data length
0 with ip length > max ip packet size
0 with header length < data size
0 with data length < header length
0 with bad options
0 with incorrect version number
0 fragments received
0 fragments dropped (dup or out of space)
0 fragments dropped after timeout
0 packets reassembled ok
10069 packets for this host
0 packets for unknown/unsupported protocol
0 packets forwarded (0 packets fast forwarded)
0 packets not forwardable
0 packets received for unknown multicast group
0 redirects sent
6970 packets sent from this host
0 packets sent with fabricated ip header
0 output packets dropped due to no bufs, etc.
6 output packets discarded due to no route
0 output datagrams fragmented
0 fragments created
0 datagrams that can't be fragmented
0 tunneling packets that can't find gif
0 datagrams with bad address in header
icmp:
0 calls to icmp_error
0 errors not generated 'cuz old message was icmp
0 messages with bad code fields
0 messages < minimum length
0 bad checksums
0 messages with bad length
0 multicast echo requests ignored
0 multicast timestamp requests ignored
0 message responses generated
ICMP address mask responses are disabled
igmp:
0 messages received
0 messages received with too few bytes
0 messages received with bad checksum
0 membership queries received
0 membership queries received with invalid field(s)
0 membership reports received
0 membership reports received with invalid field(s)
0 membership reports received for groups to which we belong
4 membership reports sent
ipsec:
0 inbound packets processed successfully
0 inbound packets violated process security policy
0 inbound packets with no SA available
0 invalid inbound packets
0 inbound packets failed due to insufficient memory
0 inbound packets failed getting SPI
0 inbound packets failed on AH replay check
0 inbound packets failed on ESP replay check
0 inbound packets considered authentic
0 inbound packets failed on authentication
0 outbound packets processed successfully
0 outbound packets violated process security policy
0 outbound packets with no SA available
0 invalid outbound packets
0 outbound packets failed due to insufficient memory
0 outbound packets with no route
ip6:
0 total packets received
0 with size smaller than minimum
0 with data size < data length
0 with bad options
0 with incorrect version number
0 fragments received
0 fragments dropped (dup or out of space)
0 fragments dropped after timeout
0 fragments that exceeded limit
0 packets reassembled ok
0 packets for this host
0 packets forwarded
0 packets not forwardable
0 redirects sent
40 packets sent from this host
0 packets sent with fabricated ip header
0 output packets dropped due to no bufs, etc.
0 output packets discarded due to no route
0 output datagrams fragmented
0 fragments created
0 datagrams that can't be fragmented
0 packets that violated scope rules
0 multicast packets which we don't join
Mbuf statistics:
0 one mbuf
0 one ext mbuf
0 two or more ext mbuf
0 packets whose headers are not continuous
0 tunneling packets that can't find gif
0 packets discarded due to too may headers
0 failures of source address selection
source addresses on an outgoing I/F
12 node-locals
23 link-locals
source addresses of same scope
23 link-locals
source addresses of a different scope
12 node-locals
0 forward cache hit
0 forward cache miss
icmp6:
0 calls to icmp_error
0 errors not generated because old message was icmp error or so
0 errors not generated because rate limitation
Output histogram:
multicast listener report: 4
router solicitation: 11
neighbor solicitation: 1
0 messages with bad code fields
0 messages < minimum length
0 bad checksums
0 messages with bad length
Histogram of error messages to be generated:
0 no route
0 administratively prohibited
0 beyond scope
0 address unreachable
0 port unreachable
0 packet too big
0 time exceed transit
0 time exceed reassembly
0 erroneous header field
0 unrecognized next header
0 unrecognized option
0 redirect
0 unknown
0 message responses generated
0 messages with too many ND options
0 messages with bad ND options
0 bad neighbor solicitation messages
0 bad neighbor advertisement messages
0 bad router solicitation messages
0 bad router advertisement messages
0 bad redirect messages
0 path MTU changes
ipsec6:
0 inbound packets processed successfully
0 inbound packets violated process security policy
0 inbound packets with no SA available
0 invalid inbound packets
0 inbound packets failed due to insufficient memory
0 inbound packets failed getting SPI
0 inbound packets failed on AH replay check
0 inbound packets failed on ESP replay check
0 inbound packets considered authentic
0 inbound packets failed on authentication
0 outbound packets processed successfully
0 outbound packets violated process security policy
0 outbound packets with no SA available
0 invalid outbound packets
0 outbound packets failed due to insufficient memory
0 outbound packets with no route
pfkey:
0 requests sent to userland
0 bytes sent to userland
0 messages with invalid length field
0 messages with invalid version field
0 messages with invalid message type field
0 messages too short
0 messages with memory allocation failure
0 messages with duplicate extension
0 messages with invalid extension type
0 messages with invalid sa type
0 messages with invalid address extension
0 requests sent from userland
0 bytes sent from userland
0 messages toward single socket
0 messages toward all sockets
0 messages toward registered sockets
0 messages with memory allocation failure
Voici aussi ce que 10 Pings sur www.apple.com donne :
Ping a démarré...
PING www.apple.com.akadns.net (17.112.152.32): 56 data bytes
64 bytes from 17.112.152.32: icmp_seq=0 ttl=43 time=171.113 ms
64 bytes from 17.112.152.32: icmp_seq=1 ttl=43 time=171.981 ms
64 bytes from 17.112.152.32: icmp_seq=2 ttl=43 time=173.492 ms
64 bytes from 17.112.152.32: icmp_seq=3 ttl=43 time=175.12 ms
64 bytes from 17.112.152.32: icmp_seq=4 ttl=43 time=171.251 ms
64 bytes from 17.112.152.32: icmp_seq=5 ttl=43 time=174.751 ms
64 bytes from 17.112.152.32: icmp_seq=6 ttl=43 time=170.791 ms
64 bytes from 17.112.152.32: icmp_seq=7 ttl=43 time=171.427 ms
64 bytes from 17.112.152.32: icmp_seq=8 ttl=43 time=173.18 ms
64 bytes from 17.112.152.32: icmp_seq=9 ttl=43 time=173.594 ms
--- www.apple.com.akadns.net ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max = 170.791/172.67/175.12 ms
