IP Level

RDNet Troubleshooting

1 ping under window

 (1)-t : ping specified host until stopped.
    -i ttl : set ip package time to live.
 under RHEL linux, -t ttl
 (2)-n count :  number of echo requests to send,4 as default
 under RHEL linux, -c count
 (3)-a : resolve address to hostnames.
 under RHEL linux, aubible(聽得見的)/tick ping
 (4)-l size :　specify size of echo request package in bytes,32 as default.
 under RHEL linux,
     -l preload : specify how many packages will be preloaded and not waiting for reply; 
     -s packagesize : specify size of data bytes to send except ICMP header data of 8 bytes,64 as default.
 (5)-f : set DO NOT Fragment bit on ping package.
 under RHEL linux, the option means flood ping and if not super user, usually works with -i interval option
 (6)-r count : specify number of hops to be recored or displayed, 9 as maximum.
    -s count : enable time report that every echo request send and reply received, 4 as maximum.

2 tracert under window

確定/追蹤source-->target的路由，each entry means specific gateway ip until target as last one. 排障時，就可以根據提示信息，大致定位網路在哪一環節出現了問題。
-d : not resolve address to hostnames.
-h : maximum pops to search for target.

Note: ping is used prior to tracert

3 nslookup

name server lookup
查詢DNS記錄並查看域名解析是否正確

4 port mirroring(端口映射)–>wireshark

區別cisco/juniper配置

5 switch performance parameter

Duplex(雙工)
    full duplex
    half duplex
Bandwidth
    like 10Gbit/s
CPU/Memory utilization
Backplane throughput

6 firewall

stateful/stateless fw configuration

7 ipv6

冒號分16進制,共8組
    2000:0000:0000:0001:0000:0000:0000:0056
    2000:0:0:1::56/128
Address type
Stateless autoconfiguration(same exists in ipv4)
    only fit with 64 bits mask

8 VLAN & Access/Trunk

區別於cisco/juniper

9 ip routing

static route config
    區別cisco/Juniper 
OSPF(鏈路狀態路由協議)
    ospf.2
    ospf.3 support ipv6
    特性：
        ***
    原理‘
        SPF
    Configuration
        區別於cisco/Juniper