Re: lug-bg: Драйвъри за мрежови платки с поддръжка на MTU>1500

Thu, 16 Dec 2004 08:55:04 -0800 

Peter Pentchev wrote:


ÐÐ ÐÐÐ ÐÐ ÑÐ ÑÑÑÑÐÐ, ÑÐ ÐÐ ÐÑÐÐÑÐÐ ÑÐÐÐÐÐ Ð ÐÐÐÑÑÐ...  Ð ÑÐÐÑÑÐ:

1. ÐÐÐÑÐÐ ÐÑÑÐÐÐÐÑÐÐÐÐÑÐ ÑÑÐÐÐÐÑÑÐÑÐ ÐÐ Ethernet, MTU ÐÐ Ethernet iface Ð
  1500, ÑÐÑÐÐ.



ÐÐÑÑÐ ÐÐÐÑÑÐÐ. ÐÑÐ IPv6 ÐÐÐÐÑÐ ÐÐ Ð 1500. ÐÑÐ ÑÐ ÐÐÐÐ ÐÐÐÑÐÐÑÑÐÑÐÑ ÐÑ Juniper ÐÐÑÐÑÑÐÐÑ ÐÐÐÐÐÐÐ Ð ethernet ÑÑÐÐÐ, Ð ÐÐÑÑÐ ÐÑÐÑÐÐ ÑÑÐÑÑÐÐÑÐ ÑÐ Ñ IPv6 (ÐÐÐ ÑÐÑ ÐÐ ÐÑÐÐÐ Ð CERN, ÐÐ ÐÐÐÐÐÐÐ ÐÐÐ Ð ÐÐ ÑÐÐÐÐÑÑÐÑÐÑÐ Ð GEANT):

interfaces {
    ge-1/0/0 {
        enable;
        vlan-tagging;
        mtu 9192;
        unit 570 {
            vlan-id 570;
            family inet6 {
                address fec0:2::2/64;
            }
        }
    }
    ge-1/2/0 {
            family inet6 {
                address fec0:3::2/64;
            }
        }
    }
}

ÐÐÑÑÐÐ ÐÐÐÐÐÐÐÐ ÐÐ ÐÐÑÐÐÐÑÑÑÐ MTU. ÐÐÐÐ Ð ÑÑÑÐ ethernet.

ÐÑÐ ÑÐ Ð ÐÐÐÐ Cisco:

interface GigabitEthernet4/2
 description ----> r05gva
 mtu 9216
 no ip address
 logging event link-status
 load-interval 30
 mls qos trust dscp
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,7,570
 switchport mode trunk
 no cdp enable


ÐÑÐ ÑÐ Ð ÐÐÐÐ Linux 2.6 (Fedora Core 3):

[EMAIL PROTECTED] root]# echo "4096 87380 128388607" > 
/proc/sys/net/ipv4/tcp_rmem
[EMAIL PROTECTED] root]# echo "4096 65530 128388607" > 
/proc/sys/net/ipv4/tcp_wmem
[EMAIL PROTECTED] root]# echo 128388607 > /proc/sys/net/core/wmem_max
[EMAIL PROTECTED] root]# echo 128388607 > /proc/sys/net/core/rmem_max
[EMAIL PROTECTED] root]# ip addr add fec0:3::3/64 dev eth0
[EMAIL PROTECTED] root]# ip -f inet6 route add fec0:1::/64 via fec0:3::2
[EMAIL PROTECTED] root]# ifconfig eth0 mtu 9000
[EMAIL PROTECTED] root]# ifconfig eth0 txqueuelen 10000

ÐÐ ÑÐ ÐÐÐÐÐÐÐÐÑ jumbo frames. ÐÐÑÑÐÑÐ ÑÐ Intel ÐÐÐÐÑÐÐÐ.

ÐÑÐÐÐ ÑÐÐÐ...

ÐÐ ÐÐÐÐÐÐ Ð ÑÐÐÐ ÐÐÐÐÐ ÐÐÑÐ ÐÐÐ Ñ ÑÐÐÐÑÐ VLAN. Ð ÐÐ ÐÐÐÐÐÐ ÐÐÐÐÐÐÐ ÐÐÑÑÑÐÐÐÐ Ñ Ethernet ÑÐÑÐÐÐÐÐÐÑÑÐ. ÐÐÐÑÐÐ ÐÐÐ ÐÐÑÐ ÐÑÑÐÐÑ IEEE ÑÑÐÐÐÐÑÑÐÑÐ ÐÐÐÐ Ñ ÐÑÑÐ, ÐÐ ÑÐÐÐ Ð ÐÑÑÐÐ ÑÐÐÐ, ÐÐÐÐÑ ÐÑ 802.1q... ÐÐ ÐÐ ÐÐÐÑÐÐÐÐÐÐÐ.

2. Ð ÐÑÐÐÐÐÐÐÐÑÐ ÐÐ VLAN's ÑÐ ÐÐÑÐÑÐÐ ÐÐÐÐ ÐÐÐÐÐÐ "ÑÐÑÐÑÐ" MTO ÐÑ 1504,
ÐÐÐÑÐ ÐÐÐÐ *ÑÐÐÐ* ÐÐ ÐÐÐÐÑÐ Ñ VLAN header. ÐÑÐ ÐÐÐ ÐÐ ÐÐÐÐÐ ÐÐ
ÐÐÐÑÐÑÐÑ ÐÐÑÐÐÐÐÐ Ethernet ÐÐÐÐÑ ÐÐÐ VLAN header, ÐÐÐÑÐ ÐÐÐÐÑ ÐÐ Ð
ÐÐ-ÐÐÐÑÐ ÐÑ 1500 ÐÐÐÑÐ, ÐÐÑÐÑÐ ÐÐÐ ÑÐÑÐÐ 1.


ÐÑÑÐ ÐÐÐÑÑÐÐ. VLAN ÑÑÐÐÐÐÑÑÐ ÐÐ ÐÑÐÐÐÐÐ ÐÐÐÐÐÐÐ MTU (ÐÐÑÐ ÑÐÑÐÑÐ, ÐÐÑÐ ÑÐÐÐ). ÐÑÐÑÐÑÐ ÐÐÐÑÐÐÐÑÐ ÐÐ ÑÑÐÐÐÐÑÑÐ Ð ÑÐ ÐÐÐÐÑ, ÑÐ 802.1q ÐÑÐÐÐÐÐ ÐÐÐÐ ÐÐÐÐ Ð ethernet ÑÐÐÑÑÐ: VLAN Frame Header = Frame Header + 4 Ð ÐÐ ÐÑÐÐÐÐ ÐÐÐÑÐÐÐÐ ÐÐ ÑÑÐÐÐÐÑÑÑÐ ÐÐ MTU. ÐÐÐÑ 4 ÐÐÐÑÐ ÐÐ VLAN-ID. ÐÑÐ ÐÐÐÐÑÐÐ ÐÐ ÐÑÐÐÐÐÑÐÑÐ ÑÑÑÐÑÐ Ñ ÑÑÐÐÐÐ ÐÐÐÐÐÐÑ ÐÐ Ð Ñ.Ð. ÐÐÐÐ ÐÐ ÑÐ ÐÐÑÐÐÐÑÐ Ð ÐÐ-ÐÐÐÑÐ Frame Header Ð ÐÐÐ ÐÐ ÐÐÐ VLAN (ÐÐÐÐÑ ÑÐÐÐ ÐÐÐÐÐ ÐÐ ÑÑÐÐÐÐÑÐÐ ÑÐÑÐÐÐÐÐÐÑÑÐ Ð ÐÐ ÑÐÐÐÑÐ Ð ÑÑÐÐÐÐÐÑÐÑÐÐÐ ÐÐÐ ÐÐ ÐÑÐÐÑÐÑÐ ÐÐÐ ÐÐÐÐÐÐ MTU ÑÑÐÐÐÐÑÑÐ).

3. Ð ÐÑÐÐÐÐÐÐÐÑÐ ÐÐ GigE ÑÐ ÐÐÑÐÑÐÐÑ jumbo frames, ÐÐÐÑÐ ÐÐÐÐÑ ÐÐ ÐÑÐÐÑ
  > 1500, ÐÐ *ÑÐÐÐ* ÐÑÑÑÑ GigE ÐÐÑÐÑÑÐÐÑÐ Ð ÐÐÐ ÑÐÐÐ ÐÐÐÐÑÐ ÐÐÑÑÐÑÐ ÑÐ
  ÑÐ ÐÐÐÐÐÐÑÐÐÐ ÐÐ ÑÐÐÐ.  ÐÐ ÑÑÐ ÑÐÐÑÑÐÐ ÐÐÐÐ ÐÐÐÐÑÐ ÐÐÐ GigE ÐÐÑÑÐ,
  ÐÐÐÑÐ ÐÐ ÑÐ ÑÑÐÐÐÑÐÐ ÐÐ ÐÑÑÐÐÑ jumbo frames ÐÑÑÑÑ 100Mbit ÐÐÑÐÑÑÐÐÑÐ.
  ÐÑÐÑÐÐÐÑÐ Ð ÐÐÐÐÐÐÑÐÑÐÐ: ÐÐÐÐ ÐÐ ÑÐÐÐ ÐÐÑÐÑÑÐÐÑ ÐÐ ÐÐÐ "ÐÐÑÐÐÐÐÐ"
  Ethernet ÐÐÑÑÐ, ÐÐÑÑÐ ÑÐ ÐÐÐÐ ÑÑÐÐÐÐÑÑÐ Ð ÐÑÐÑÑÐ ÐÐ ÐÐÐÐ ÐÐ ÐÑÐÐÐÑÑÐÐ
  ÑÑÐÐÐ, ÐÐ-ÐÐÐÑÐ ÐÑ 1500 ÐÐÐÑÐ.



... ÐÐÐÐÐ ÐÑ IPv4!!!

ÐÑÐÐÐ ÑÐÐÐ ÐÐ ÐÐÑÐÑ ÐÐ 100 Mbps ÐÐÑÑÐ, ÐÐÐÑÐ ÐÐÐÐÑ ÐÐ ÐÐÐÐÑÑÐÐÑ MTU 1504. ÐÐÑÐÑ, ÑÐ ÑÐÐÐÐÐ ÑÐÐÐÐÐÐÑÐ Ð ÐÐÐÐÐ ÐÐ-ÐÑÑÐÐ ÐÐÑÐÐÐ...

  ÐÐÑÐ


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