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packeti s default size
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Автор:  dmitev [ Вто Дек 01, 2009 12:14 pm ]
Заглавие:  packeti s default size
Zdravejte,
zashto ne preminavat paketi s po goljamo ot 1000 MTU. Ima li limitatsia ot vasha strana svyrzana s kachestvoto na LAN svyrzanosta?

eth0 Link encap:Ethernet HWaddr 00:a0:d1:be:8b:96
inet addr:10.230.221.xxx Bcast:10.230.221.255 Mask:255.255.255.0
inet6 addr: fe80::2a0:d1ff:febe:8b96/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:22489610 errors:0 dropped:0 overruns:0 frame:0
TX packets:20323832 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:215344095 (205.3 MiB) TX bytes:3875722062 (3.6 GiB)
Interrupt:10 Base address:0x2000

ppp0 Link encap:Point-to-Point Protocol
inet addr:195.230.1.xxx P-t-P:195.230.5.66 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:1062042 errors:0 dropped:0 overruns:0 frame:0
TX packets:985793 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:845810763 (806.6 MiB) TX bytes:391130319 (373.0 MiB)


[root@dimiter ~]# ping -s 1500 195.230.5.66
PING 195.230.5.66 (195.230.5.66): 1500 data bytes
^C--- 195.230.5.66 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

[root@dimiter ~]# ping -s 1200 195.230.5.66
PING 195.230.5.66 (195.230.5.66): 1200 data bytes
^C--- 195.230.5.66 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

[root@dimiter ~]# ping -s 1100 195.230.5.66
PING 195.230.5.66 (195.230.5.66): 1100 data bytes
^C--- 195.230.5.66 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss

[root@dimiter ~]# ping -s 1000 195.230.5.66
PING 195.230.5.66 (195.230.5.66): 1000 data bytes
1008 bytes from 195.230.5.66: icmp_seq=0 ttl=64 time=2.000 ms
^C--- 195.230.5.66 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.000/2.000/2.000/0.000 ms

BR,
dimiter
Автор:  etg [ Вто Дек 01, 2009 1:13 pm ]
Заглавие:  Re: packeti s default size
Ограничени са само icmp echo-request пакетите, за останалите няма ограничение:
iptables -t mangle -I PREROUTING -m length --length 1029: -p icmp --icmp-type echo-request -j DROP
Автор:  dmitev [ Вто Дек 01, 2009 1:49 pm ]
Заглавие:  Re: packeti s default size
Mda, ne proverih s TCP/IP ... tam neshtata naistina sa drugi ;) ... blagodarja

[root@dimiter ~]# tcptraceroute -l 1400 www.yahoo.com
Selected device ppp0, address 195.230.1.xxx, port 54883 for outgoing packets
Tracing the path to www.yahoo.com (87.248.113.14) on TCP port 80 (www), 30 hops max, 1400 byte packets
1 gw.d2-online.net (195.230.5.66) 2.999 ms 2.998 ms 2.999 ms
2 twi.d2-online.net (195.230.5.177) 2.998 ms 2.998 ms 2.999 ms
3 195.230.0.225 2.998 ms 1.999 ms 2.998 ms
4 ge-1-0-4--br2.sof.ITDNet.net (212.116.129.41) 2.998 ms 2.998 ms 3.998 ms
5 ge-1-1-2-fra.eu-exchange.net (80.81.192.156) 48.975 ms 47.976 ms 46.976 ms
6 ge-1-3-0.pat1.dee.yahoo.com (80.81.192.115) 50.974 ms 48.976 ms 49.975 ms
7 so-0-0-0.pat1.tc2.yahoo.com (66.196.65.2) 72.963 ms 71.964 ms 70.965 ms
8 so-0-1-0.msr2.ird.yahoo.com (66.196.65.43) 84.958 ms 83.958 ms 84.958 ms
9 te-8-4.bas-b2.ird.yahoo.com (87.248.101.109) 85.957 ms 84.958 ms 84.957 ms
10 f1.us.www.vip.ird.yahoo.com (87.248.113.14) [open] 84.957 ms 84.957 ms 85.957 ms


BR,
dimiter
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