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After clicking on the A tab in the page, to jump to the corresponding place in the page, the method is simple, that is, the contents of the href in the a tag and the ID you want to jump to this area are the same, for example:ahref= "#ppp" target= "_blank ">Jumpa>P>P1P>BR/>BR/>BR/>P>P1P>BR/>

Crawlers start with "mechanic ". Machize This article is only for study notes. You are welcome to discuss and make mistakes. The following are basic operations: 1 import mechanic 2 # create a browser object 3 br = mechanic. browser () 4 # below are some basic settings 5 # Set whether to process the HTML html-equiv header. When the Browser and other devices receive files transmitted by the server, first, it receives the relevant name/value pairs of t

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Linux dual-line IP settings (no additional routing table required, just modify the following OK)ModifyVi/etc/iproute2/rt_tables(Increase the number of telecom and netcom two routing tables)Increase252 Tel (Telecom)251 CNC (netcom)(Set up telecom and Netcom routing table contents)Vi/etc/rc.d/rc.localIncreaseIP route replace the default via Telecom Gateway Dev eth0 (routing line)IP Route Flush Table Tel (Refresh Tel routing table)IP route add default via telecom Gateway DEV eth0 src

); * Pt_prev = NULL; } Return br_handle_frame_hook (port, pskb ); } The actual implementation of bridge_handle_frame_hook: /* Net/bridge/br. c */ Static int _ init br_init (void) { ...... Br_handle_frame_hook = br_handle_frame; ...... } Br_handle_frame: prerouting point of PF_BEIDGE /* Net/bridge/br_input.c */ Int br_handle_frame (struct net_bridge_port * p, struct sk_buff ** pskb) { Struct sk_buff * skb = * pskb; Const unsigned char * dest = et

= External= Physnet1:£ ºOn the network node:#为连接物理交换机的网卡 eth2 and Eth3 build OVS physical bridge, where eth2 is used for data networks, ETH3 for external networks OVS-vsctl add-br br-eth2Ovs-vsctl add-br Br-exovs-vsctl add-port br-eth2 eth2/etc/neutron/plugins/ml2/= Flat,vl

1. Background No DVR scenarios are used: It is clear from the diagram that the east-west and north-south traffic will be centralized to the network nodes, which will make the network nodes a bottleneck. If you enable DVR, the following figure: For east-west traffic, traffic is passed directly between compute nodes. For the north-South flow, if there is floating IP, traffic directly to the compute node. If there is no floating IP, the network node is gone. 2. Deployment and Flow direct

, br-ex to eth0 (corresponding to my environment is Em1) to access the external network Install the Operating System Use a CD or image file to install the operating system. When partitioning, You need to divide a logical zone and create a group named cinder-volumes. This logical volume group will be used by cinder. The created results are similar: For the creation process see: http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-lvm-diskdruid-

machines is through eth1 (corresponding to my environment is em2). virtual machines access external networks through the L3agent on Server 1, br-ex to eth0 (corresponding to my environment is em1) to access the external network Install the Operating System Use a CD or image file to install the operating system. When partitioning, You need to divide a logical zone and create a group named cinder-volumes. This logical volume group will be used by cind

OpenvSwitch Port Mirror in OpenStack Neutron Preface I recently built an OpenStack Environment Based on VXLAN and found that the package to dump ovs interfaces is still quite troublesome. After many efforts, find some trouble shooting methods in the network environment of openstack. In addition to common tools such as ping, host, traceroute, tcpdump, ip neighbor, arp, and arping, you can also use port mirror to dump ovs packets. Environment There are two nodes in my environment. node1 enab

VLAN10, Neutron uses the VLAN network type at this time, The flow of communication between them is: (1) Vm1-1 sends a pure message (the VM can accept and send the thermal insulation with vid, described in the following article) to QBR-XX. QBR-XX is a Linux bridge device that connects with Vm1-1 through a tap device, and they actually have only 1 tap devices, which can be understood as a tap device half on a BR on a VM, where 2 taps are drawn for ease

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] ieee80211 phy0:rt2x00queue_write_tx_frame:error-dropping frame due to full TX queue 2When using WiFi restart, the following debug message appears. Still not normal internet, this time just have to restart the router talent enough to solve the problem.[106572.440000] Br-lan2:port 2 (wlan0-1) entered disabled state[106572.450000] Device wlan0-1 left promiscuous mode[106572.450000] Br-lan2:port 2 (wlan0-1) e

TX queue 2[102318.720000] ieee80211 phy0: rt2x00queue_write_tx_frame: Error-dropping frame due to full TX queue 2 When WiFi restart is used, the following debug information will appear, and the network cannot be accessed normally. This problem can be solved only by restarting the router. [106572.440000] br-lan2: Port 2 (wlan0-1) entered disabled state[2, 106572.450000] device wlan0-1 left promiscuous mode[106572.450000]

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1 Viewing remote branches 123456789101112131415 $ git branch -a* br-2.1.2.2masterremotes/origin/HEAD-> origin/masterremotes/origin/br-2.1.2.1remotes/origin/br-2.1.2.2 remotes/origin/br-2.1.3remotes/origin/master 2 Viewing local branches 12345 $ git branch*