FC1 -> FC2: very slow xDSL connection...

antonio montagnani anto.montagnani at virgilio.it
Thu Jul 1 08:58:55 UTC 2004


Andrea Giuliano wrote/ha scritto, On/il 01/07/2004 10:32:

>Dear Antonio,
>
>how did you choose the parameters for you eth0 interface? I suppose I
>cannot choose the same, right? What should I use instead?
>
>Also, with respect to another post of yours, how did you choose and set
>the parameters I see in the output of "route -N"?
>
>Many thanks again.
>
>
>On Fri, 2004-06-25 at 14:30, antonio montagnani wrote:
>  
>
>>Andrea Giuliano wrote/ha scritto, On/il 25/06/2004 13:40:
>>
>>    
>>
>>>On Fri, 2004-06-25 at 10:57, Fons van der Beek wrote:
>>>
>>> 
>>>
>>>      
>>>
>>>>perhaps (most probably)  you should change your mtu settings of your eth0
>>>>card
>>>>common is 1490 or 1492
>>>>   
>>>>
>>>>        
>>>>
>>>I guess it is already. I'm almost sure I saw that value in the output of
>>>tcpdump. The MTU for ppp is 1500, instead, and I think that's right:
>>>1492+8, the eth0 MTU plus the 8 byte overhead of ppp.
>>>
>>>But I need to check again. On Monday I'll be back with some logs and
>>>outputs...
>>>
>>>Best regards.
>>> 
>>>
>>>      
>>>
>>This is the output of
>>/sbin/ifconfig.... My MTU is 1500 on both ethernet cards and 1492 on 
>>ppp.I have no problem with net surfing.Please check!!!
>>
>>eth0      Link encap:Ethernet  HWaddr 52:54:05:E5:82:46
>>          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
>>          inet6 addr: fe80::5054:5ff:fee5:8246/64 Scope:Link
>>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>          RX packets:6532 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:11639 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:5 txqueuelen:1000
>>          RX bytes:606287 (592.0 Kb)  TX bytes:14855134 (14.1 Mb)
>>          Interrupt:10 Base address:0xe400
>> 
>>eth1      Link encap:Ethernet  HWaddr 00:00:B4:9D:0E:78
>>          inet addr:192.168.254.2  Bcast:192.168.254.255  Mask:255.255.255.0
>>          inet6 addr: fe80::200:b4ff:fe9d:e78/64 Scope:Link
>>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>          RX packets:149273 errors:0 dropped:0 overruns:0 frame:1
>>          TX packets:141513 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:12 txqueuelen:1000
>>          RX bytes:156985292 (149.7 Mb)  TX bytes:13641641 (13.0 Mb)
>>          Interrupt:5 Base address:0xe800
>> 
>>lo        Link encap:Local Loopback
>>          inet addr:127.0.0.1  Mask:255.0.0.0
>>          inet6 addr: ::1/128 Scope:Host
>>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>>          RX packets:60040 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:60040 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:0
>>          RX bytes:35245542 (33.6 Mb)  TX bytes:35245542 (33.6 Mb)
>> 
>>ppp0      Link encap:Point-to-Point Protocol
>>          inet addr:80.117.47.154  P-t-P:192.168.100.1  Mask:255.255.255.255
>>          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
>>          RX packets:147511 errors:0 dropped:0 overruns:0 frame:0
>>          TX packets:139611 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:3
>>          RX bytes:153628941 (146.5 Mb)  TX bytes:10436433 (9.9 Mb)
>>
>>
>>-- 
>>
>> Antonio 
>>
>> =========================================================
>> Working with  Mozilla 1.7 on Redhat Linux Fedora Core 2
>> =========================================================
>> =========================================================
>>     Uso Mozilla 1.7 su Redhat Linux Fedora Core 2
>> =========================================================
>>    
>>
What is your modem?? please note that my eth0 is the interface to the 
LAN and eth1 is to Internet.
I didn't change nothing, I fixed only  IP numbers  for my comfort 
(especially to the internal interface, as it is a router/proxy/gateway).
I get the DNS numbers from modem.....and I didn't touch any MTU setting 
(Linux is not Windows..in a network!!!): it works just out of the box!!
Any way please post again the output of command route -n and revert to 
the original MTU values....

-- 
 Antonio

================================================
 Working with Mozilla 1.7 on Linux Fedora Core 2
================================================
   Utilizzo Mozilla 1.7 su Linux Fedora Core 2
================================================





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