RIP
RIP: distance-vector routing protocol.
Based UDP520 port work; use as a measure of the number of hops; period and triggered updates are present; -30s update cycle time; support for load balancing and other expenses, default 4, maximum 6, IOS version 12.4 or more is 16; update cycle - Paul live, confirmed; management distance of 120.
1. Routing placement guidelines:
1) there is no routing table, added to it. Package is the next hop from router when out of the mouth from which it directly into the bag, extracted.
2) If the routing table has a different look at the agreement from management, who put little who. If the same kind of agreement, should look at metrics, but will not actually see. Look at whether homologous, if homologous unconditionally modified (homology: the same next hop). Different sources, will look overhead.
2. declare that:
1) determine which address in the dissemination.
2) declared that the interface has the ability to send and receive information to RIP.
If the network fluctuates, rip will send request packets from all interfaces, all routers must be responded to recover the lost route.
----- network change results in a loop
prevention mechanism 3.RIP ring of:
1) the level of segmentation: Since the intake port, not from the mouth. But sometimes split horizon harmful (in the HUB-SPOK structure), it is necessary to cancel split horizon, closed in the interface: command (no ip split-horizon).
2) Poison Reverse: Toxicity spread out, toxicity is back. Toxicity: may death (probable down) poison reverse split horizon routing can be ignored.
3) :( suppression timer to suppress homologous update) homologous to update, and then wait for the update 180s. After the 180s as well as updates, the route of death; but if this route within the 180 back, alive.
4) Hop Limit: The maximum jump fifteen, sixteen jump up.
4. Passive Interface : not only receives the transmission generally acts as a gateway interface (hereinafter, all protocols are met for gateway knock command)
command: Router RIP
passive-interface E0 /. 1
. ** offset list. 5 (Control Plane): ** interferometer RIP routing
the traffic to or from the control plane interface, traffic crawling, then increase the flow rate of the metric, can be superimposed; eventually affect routing;
fetch route r1 (config) # access-list 1 3.0.0.0 the permit
R1 (config) #router RIP
R1 (config-Router). 1 List-offset # 2 in Serial 1/1
the ACL corresponding to the direction of increasing number of hops interface
6.RIP declared disadvantages : the main class declaration
solution: inlet Interface
no ip rip receive version 2
Send IP RIP Version 2 NO
7.ACL ACL is a packet filter based access control technique.
acl: standard only caught the end of the source IP acl must be coupled (Access deny the any-List 1)
Access-List 1 in permit 10.1.1.0// crawl 10.1.1.0/24 routing
access-list 1 permit 10.1.1.0 0.0 // fetch 10.1.1.0/24 10.1.1.1/32 .0.255 and
inverted: 1 represents a do not care; 0 represents care
gripping the end of the even-numbered address 10.1.1.0/24:
Access-List 1 the permit 10.1.1.0 0.0.0.254 // grab an even number of
access-list 1 permit 10.1.1.1 0.0.0.254// catch the odd
extension acl: you can also tcp flag
rst ---- reset the bit to stop you visit a site
time-range - the effective time acl section to set the effective time (setting is not permanent)
grasping flow, generally do not grasp the source port, because it is random.
the permit TCP-100 List Access Host Host 1.1.1.1 2.2.2.2 EQ 23 is
IP Extended Access-List table 10 is inserted into a // acl
acl only one capture tool.
8.nat : Show Translations' ip nat (nat query table)
inside-> outside will check the routing tables then converted nat (Source Converter)
outside-> nat Inside the first routing table and then check the conversion (conversion object)
