??????? The max value from conf\/{all,interface}\/arp_ignore is used<\/pre>\n??????? when ARP request is received on the {interface}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\narp_ignore:\u5b9a\u4e49\u5bf9\u76ee\u6807\u5730\u5740\u4e3a\u672c\u5730IP\u7684ARP\u8be2\u95ee\u4e0d\u540c\u7684\u5e94\u7b54\u6a21\u5f0f0<\/p>\n
0 – (\u9ed8\u8ba4\u503c):?\u56de\u5e94\u4efb\u4f55\u7f51\u7edc\u63a5\u53e3\u4e0a\u5bf9\u4efb\u4f55\u672c\u5730IP\u5730\u5740\u7684arp\u67e5\u8be2\u8bf7\u6c42<\/p>\n
1 -?\u53ea\u56de\u7b54\u76ee\u6807IP\u5730\u5740\u662f\u6765\u8bbf\u7f51\u7edc\u63a5\u53e3\u672c\u5730\u5730\u5740\u7684ARP\u67e5\u8be2\u8bf7\u6c42<\/p>\n
2 -\u53ea\u56de\u7b54\u76ee\u6807IP\u5730\u5740\u662f\u6765\u8bbf\u7f51\u7edc\u63a5\u53e3\u672c\u5730\u5730\u5740\u7684ARP\u67e5\u8be2\u8bf7\u6c42,\u4e14\u6765\u8bbfIP\u5fc5\u987b\u5728\u8be5\u7f51\u7edc\u63a5\u53e3\u7684\u5b50\u7f51\u6bb5\u5185<\/p>\n
3 -?\u4e0d\u56de\u5e94\u8be5\u7f51\u7edc\u754c\u9762\u7684arp\u8bf7\u6c42\uff0c\u800c\u53ea\u5bf9\u8bbe\u7f6e\u7684\u552f\u4e00\u548c\u8fde\u63a5\u5730\u5740\u505a\u51fa\u56de\u5e94<\/p>\n
4-7 -?\u4fdd\u7559\u672a\u4f7f\u7528<\/p>\n
8 -\u4e0d\u56de\u5e94\u6240\u6709\uff08\u672c\u5730\u5730\u5740\uff09\u7684arp\u67e5\u8be2<\/p>\n
\u6709\u5173arp_announce<\/strong>\u7684\u76f8\u5173\u4ecb\u7ecd\uff1a<\/p>\n\n\n\n\narp_announce - INTEGER<\/pre>\n??????? Define different restriction levels for announcing the local<\/pre>\n??????? source IP address from IP packets in ARP requests sent on<\/pre>\n??????? interface:<\/pre>\n??????? 0 - (default) Use any local address, configured on any interface<\/pre>\n??????? 1 - Try to avoid local addresses that are not in the target's<\/pre>\n??????? subnet for this interface. This mode is useful when target<\/pre>\n??????? hosts reachable via this interface require the source IP<\/pre>\n??????? address in ARP requests to be part of their logical network<\/pre>\n??????? configured on the receiving interface. When we generate the<\/pre>\n??????? request we will check all our subnets that include the<\/pre>\n??????? target IP and will preserve the source address if it is from<\/pre>\n??????? such subnet. If there is no such subnet we select source<\/pre>\n??????? address according to the rules for level 2.<\/pre>\n??????? 2 - Always use the best local address for this target.<\/pre>\n??????? In this mode we ignore the source address in the IP packet<\/pre>\n??????? and try to select local address that we prefer for talks with<\/pre>\n??????? the target host. Such local address is selected by looking<\/pre>\n??????? for primary IP addresses on all our subnets on the outgoing<\/pre>\n??????? interface that include the target IP address. If no suitable<\/pre>\n??????? local address is found we select the first local address<\/pre>\n??????? we have on the outgoing interface or on all other interfaces,<\/pre>\n??????? with the hope we will receive reply for our request and<\/pre>\n??????? even sometimes no matter the source IP address we announce.<\/pre>\n<\/pre>\n??????? The max value from conf\/{all,interface}\/arp_announce is used.<\/pre>\n<\/pre>\n??????? Increasing the restriction level gives more chance for<\/pre>\n??????? receiving answer from the resolved target while decreasing<\/pre>\n??????? the level announces more valid sender's information.<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\narp_announce:\u5bf9\u7f51\u7edc\u63a5\u53e3\u4e0a\uff0c\u672c\u5730IP\u5730\u5740\u7684\u53d1\u51fa\u7684\uff0cARP\u56de\u5e94\uff0c\u4f5c\u51fa\u76f8\u5e94\u7ea7\u522b\u7684\u9650\u5236:?\u786e\u5b9a\u4e0d\u540c\u7a0b\u5ea6\u7684\u9650\u5236,\u5ba3\u5e03\u5bf9\u6765\u81ea\u672c\u5730\u6e90IP\u5730\u5740\u53d1\u51faArp\u8bf7\u6c42\u7684\u63a5\u53e3<\/p>\n 0 – (\u9ed8\u8ba4)?\u5728\u4efb\u610f\u7f51\u7edc\u63a5\u53e3\uff08eth0,eth1\uff0clo\uff09\u4e0a\u7684\u4efb\u4f55\u672c\u5730\u5730\u5740<\/p>\n 1 -\u5c3d\u91cf\u907f\u514d\u4e0d\u5728\u8be5\u7f51\u7edc\u63a5\u53e3\u5b50\u7f51\u6bb5\u7684\u672c\u5730\u5730\u5740\u505a\u51faarp\u56de\u5e94.?\u5f53\u53d1\u8d77ARP\u8bf7\u6c42\u7684\u6e90IP\u5730\u5740\u662f\u88ab\u8bbe\u7f6e\u5e94\u8be5\u7ecf\u7531\u8def\u7531\u8fbe\u5230\u6b64\u7f51\u7edc\u63a5\u53e3\u7684\u65f6\u5019\u5f88\u6709\u7528.\u6b64\u65f6\u4f1a\u68c0\u67e5\u6765\u8bbfIP\u662f\u5426\u4e3a\u6240\u6709\u63a5\u53e3\u4e0a\u7684\u5b50\u7f51\u6bb5\u5185ip\u4e4b\u4e00.\u5982\u679c\u6539\u6765\u8bbfIP\u4e0d\u5c5e\u4e8e\u5404\u4e2a\u7f51\u7edc\u63a5\u53e3\u4e0a\u7684\u5b50\u7f51\u6bb5\u5185,\u90a3\u4e48\u5c06\u91c7\u7528\u7ea7\u522b2\u7684\u65b9\u5f0f\u6765\u8fdb\u884c\u5904\u7406.<\/p>\n 2 -?\u5bf9\u67e5\u8be2\u76ee\u6807\u4f7f\u7528\u6700\u9002\u5f53\u7684\u672c\u5730\u5730\u5740.\u5728\u6b64\u6a21\u5f0f\u4e0b\u5c06\u5ffd\u7565\u8fd9\u4e2aIP\u6570\u636e\u5305\u7684\u6e90\u5730\u5740\u5e76\u5c1d\u8bd5\u9009\u62e9\u4e0e\u80fd\u4e0e\u8be5\u5730\u5740\u901a\u4fe1\u7684\u672c\u5730\u5730\u5740.\u9996\u8981\u662f\u9009\u62e9\u6240\u6709\u7684\u7f51\u7edc\u63a5\u53e3\u7684\u5b50\u7f51\u4e2d\u5916\u51fa\u8bbf\u95ee\u5b50\u7f51\u4e2d\u5305\u542b\u8be5\u76ee\u6807IP\u5730\u5740\u7684\u672c\u5730\u5730\u5740.?\u5982\u679c\u6ca1\u6709\u5408\u9002\u7684\u5730\u5740\u88ab\u53d1\u73b0,\u5c06\u9009\u62e9\u5f53\u524d\u7684\u53d1\u9001\u7f51\u7edc\u63a5\u53e3\u6216\u5176\u4ed6\u7684\u6709\u53ef\u80fd\u63a5\u53d7\u5230\u8be5ARP\u56de\u5e94\u7684\u7f51\u7edc\u63a5\u53e3\u6765\u8fdb\u884c\u53d1\u9001.<\/p>\n \u5173\u4e8e\u5bf9arp_announce?\u7406\u89e3\u7684\u4e00\u70b9\u8865\u5145<\/p>\n \n\n\n| Assume that a linux box X has three interfaces – eth0, eth1 and eth2. Each interface has an IP address IP0,IP1 and IP2. When a local application tries to send an IP packet with IP0 through the eth2. Unfortunately,<\/p>\n the target node\u2019s mac address is not resolved. Thelinux box X will send the ARP request to know<\/p>\n the mac address of the target(or the gateway). In this case what is the IP source address of the<\/p>\n \u201cARP request message\u201d? The IP0- the IP source address of the transmitting IP or IP2 – the outgoing<\/p>\n interface? Until now(actually just 3 hours before) ARP request uses the IP address assigned to<\/p>\n the outgoing interface(IP2 in the above example) However the linux\u2019s behavior is a little bit<\/p>\n different. Actually the selection of source address in ARP request is totally configurable<\/p>\n bythe proc variable?\u201carp_announce\u201d<\/p>\n If we want to use the IP2 not the IP0 in the ARP request, we should change the value to 1 or 2.<\/p>\n The default value is 0 – allow IP0 is used for ARP request.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u5176\u5b9e\u5c31\u662f\u8def\u7531\u5668\u7684\u95ee\u9898\uff0c\u56e0\u4e3a\u8def\u7531\u5668\u4e00\u822c\u662f\u52a8\u6001\u5b66\u4e60ARP\u5305\u7684\uff08\u4e00\u822c\u52a8\u6001\u914d\u7f6eDHCP\u7684\u8bdd\uff09\uff0c\u5f53\u5185\u7f51\u7684\u673a\u5668\u8981\u53d1\u9001\u4e00\u4e2a\u5230\u5916\u90e8\u7684ip\u5305\uff0c\u90a3\u4e48\u5b83\u5c31\u4f1a\u8bf7\u6c42?\u8def\u7531\u5668\u7684Mac\u5730\u5740\uff0c\u53d1\u9001\u4e00\u4e2aarp\u8bf7\u6c42\uff0c\u8fd9\u4e2aarp\u8bf7\u6c42\u91cc\u9762\u5305\u62ec\u4e86\u81ea\u5df1\u7684ip\u5730\u5740\u548cMac\u5730\u5740\uff0c\u800clinux\u9ed8\u8ba4\u662f\u4f7f\u7528ip\u7684\u6e90ip\u5730\u5740\u4f5c\u4e3aarp\u91cc\u9762?\u7684\u6e90ip\u5730\u5740\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u53d1\u9001\u8bbe\u5907\u4e0a\u9762\u7684?\uff0c\u8fd9\u6837\u5728lvs\u8fd9\u6837\u7684\u67b6\u6784\u4e0b\uff0c\u6240\u6709\u53d1\u9001\u5305\u90fd\u662f\u540c\u4e00\u4e2aVIP\u5730\u5740\uff0c\u90a3\u4e48arp\u8bf7\u6c42\u5c31\u4f1a\u5305\u62ecVIP\u5730\u5740\u548c\u8bbe\u5907Mac\uff0c\u800c\u8def\u7531\u5668\u6536\u5230\u8fd9\u4e2aarp\u8bf7\u6c42\u5c31\u4f1a\u66f4\u65b0\u81ea\u5df1\u7684arp\u7f13\u5b58\uff0c\u8fd9\u6837\u5c31\u4f1a\u9020\u6210ip\u6b3a\u9a97\u4e86\uff0cVIP\u88ab\u62a2\u593a\uff0c\u6240\u4ee5\u5c31\u4f1a\u6709\u95ee\u9898\u3002<\/p>\n arp\u7f13\u5b58\u4e3a\u4ec0\u4e48\u4f1a\u66f4\u65b0\u4e86\uff0c\u4ec0\u4e48\u65f6\u5019\u4f1a\u66f4\u65b0\u5462\uff0c\u4e3a\u4e86\u51cf\u5c11arp\u8bf7\u6c42\u7684\u6b21\u6570\uff0c\u5f53\u4e3b\u673a\u63a5\u6536\u5230\u8be2\u95ee\u81ea\u5df1\u7684arp\u8bf7\u6c42\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u628a\u6e90ip\u548c\u6e90Mac\u653e\u5165\u81ea?\u5df1\u7684arp\u8868\u91cc\u9762\uff0c\u65b9\u4fbf\u63a5\u4e0b\u6765\u7684\u901a\u8baf\u3002\u5982\u679c\u6536\u5230\u4e0d\u662f\u8be2\u95ee\u81ea\u5df1\u7684\u5305\uff08arp\u662f\u5e7f\u64ad\u7684\uff0c\u6240\u6709\u4eba\u90fd\u6536\u5230\uff09\uff0c\u5c31\u4f1a\u4e22\u6389\uff0c\u8fd9\u6837\u4e0d\u4f1a\u9020\u6210arp\u8868\u91cc\u9762\u65e0\u7528\u6570\u636e\u592a\u591a\u5bfc\u81f4?\u6709\u7528\u7684\u8bb0\u5f55\u88ab\u5220\u9664\u3002<\/p>\n \u5728\u8bbe\u7f6e\u53c2\u6570\u7684\u65f6\u5019\u5c06arp_ignore?\u8bbe\u7f6e\u4e3a1\uff0c\u610f\u5473\u7740\u5f53\u522b\u4eba\u7684arp\u8bf7\u6c42\u8fc7\u6765\u7684\u65f6\u5019\uff0c\u5982\u679c\u63a5\u6536\u7684\u8bbe\u5907\u4e0a\u9762\u6ca1\u6709\u8fd9\u4e2aip\uff0c\u5c31\u4e0d\u505a\u51fa\u54cd\u5e94\uff0c\u9ed8\u8ba4\u662f0\uff0c\u53ea\u8981\u8fd9\u53f0\u673a\u5668\u4e0a\u9762\u4efb\u4f55\u4e00\u4e2a\u8bbe\u5907\u4e0a\u9762\u6709\u8fd9\u4e2aip\uff0c\u5c31\u54cd\u5e94arp\u8bf7\u6c42\uff0c\u5e76\u53d1\u9001mac\u5730\u5740<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" \u5148\u7b80\u5355\u7684\u4ecb\u7ecd\u4e0b\u5173\u4e8eLVS\u8d1f\u8f7d\u5747\u8861 LVS\uff08Linux Virtual Server\uff09Linux\u670d\u52a1\u5668\u96c6\u7fa4\u7cfb\u7edf \u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,5],"tags":[],"class_list":["post-268","post","type-post","status-publish","format-standard","hentry","category-server","category-practice-readme"],"_links":{"self":[{"href":"https:\/\/web.jofar.cn\/index.php?rest_route=\/wp\/v2\/posts\/268","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.jofar.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/web.jofar.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/web.jofar.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/web.jofar.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=268"}],"version-history":[{"count":0,"href":"https:\/\/web.jofar.cn\/index.php?rest_route=\/wp\/v2\/posts\/268\/revisions"}],"wp:attachment":[{"href":"https:\/\/web.jofar.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=268"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/web.jofar.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=268"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/web.jofar.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} | |