Tuesday, November 14, 2017
Restart networking under Ubuntu
Task: Restart networking under Ubuntu Linux
Open terminal (command line) and type the following command:
$ sudo /etc/init.d/networking restartTo start networking service, enter:
$ sudo /etc/init.d/networking startTo stop networking service, enter:
$ sudo /etc/init.d/networking stopProviding DNSv6 server info via ISG
Here we are trying to assign IPv6 address using SLAAC and send DNS v6 server info using DHCPv6.
For this we have to confogure a IPv6 local pool in ISG as show below:
ipv6 local pool RED 6868::/48 64
First, configure the ISG as DHCPv6 server by defining a IPv6 pool
ASR-2#show run | s POOL14
ipv6 dhcp pool POOL14
dns-server 1818::1818
##################################################
Now add the below commands to the access interface config:
ASR-2#show run int g1/2/1.200
Building configuration...
Current configuration : 279 bytes
!
interface GigabitEthernet1/2/1.200
encapsulation dot1Q 200
ip unnumbered Loopback66
ipv6 enable
ipv6 nd other-config-flag <<<<<<<<<
ipv6 dhcp server POOL14 <<<<<<<<<<
service-policy type control START_MAC
ip subscriber l2-connected
initiator unclassified mac-address
initiator dhcp
end
ASR-2#
ASR-2#
ASR-2#
Enable below debugs:
ASR-2#debug ipv6 dhcp detail
IPv6 DHCP debugging is on (detailed)
ASR-2#
ASR-2#
ASR-2#
ASR-2#config t
Enter configuration commands, one per line. End with CNTL/Z.
ASR-2(config)#logg conso
ASR-2(config)#^Z
ASR-2#
ASR-2#
ASR-2#
ASR-2#sss
%No active Subscriber Sessions
ASR-2#
*Aug 22 08:58:21.455 IST: %SYS-5-CONFIG_I: Configured from console by console
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Received INFORMATION-REQUEST from FE80::201:11FF:FE11:2222 on GigabitEthernet1/2/2.500
*Aug 22 08:58:37.406 IST: IPv6 DHCP: detailed packet contents
*Aug 22 08:58:37.406 IST: src FE80::201:11FF:FE11:2222 (GigabitEthernet1/2/2.500)
*Aug 22 08:58:37.406 IST: dst FF02::1:2
*Aug 22 08:58:37.406 IST: type INFORMATION-REQUEST(11), xid 7260385
*Aug 22 08:58:37.406 IST: option ELAPSED-TIME(8), len 2
*Aug 22 08:58:37.406 IST: elapsed-time 0
*Aug 22 08:58:37.406 IST: option CLIENTID(1), len 10
*Aug 22 08:58:37.406 IST: 00030001442B035DFF80
*Aug 22 08:58:37.406 IST: option ORO(6), len 6
*Aug 22 08:58:37.406 IST: DNS-SERVERS,DOMAIN-LIST,UNKNOWN
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Using interface pool POOL14
*Aug 22 08:58:37.406 IST: IPv6 DHCP_AAA: Retrieved subblock; It has AAA DNS_SERVERS=0
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Source Address from SAS FE80::227:DFF:FE4E:D562
*Aug 22 08:58:37.406 IST: IPv6 DHCP: detailed packet contents
*Aug 22 08:58:37.406 IST: src FE80::227:DFF:FE4E:D562
*Aug 22 08:58:37.406 IST: dst FE80::201:11FF:FE11:2222 (GigabitEthernet1/2/2.500)
*Aug 22 08:58:37.406 IST: type REPLY(7), xid 7260385
*Aug 22 08:58:37.406 IST: option SERVERID(2), len 10
*Aug 22 08:58:37.406 IST: 0003000100270D4ED500
*Aug 22 08:58:37.406 IST: option CLIENTID(1), len 10
*Aug 22 08:58:37.406 IST: 00030001442B035DFF80
*Aug 22 08:58:37.406 IST: option DNS-SERVERS(23), len 16
*Aug 22 08:58:37.406 IST: 1818::1818
*Aug 22 08:58:37.406 IST: IPv6 DHCP: Sending REPLY to FE80::201:11FF:FE11:2222 on GigabitEthernet1/2/2.500
ASR-2#
####################################################################################
Enable below debug in client:
client#debug ipv6 dhcp detail
IPv6 DHCP debugging is on (detailed)
client#
client#
client#config t
Enter configuration commands, one per line. End with CNTL/Z.
client(config)#int g0/2.500
client(config-subif)#shut
*Aug 22 15:55:55.767: IPv6 DHCP: Stopping client stateless autoconfig
*Aug 22 15:55:55.767: IPv6 DHCP: Unconfiguring DNS server 1818::1818
client(config-subif)#
client(config-subif)#
client(config-subif)#
client(config-subif)#no shut
client(config-subif)#
*Aug 22 15:56:05.379: DEBUG_SWITCH:ARP 64.64.64.3 64.64.64.1
*Aug 22 15:56:05.379: DEBUG_SWITCH:OFP Roaming 64.64.64.1 observed
*Aug 22 15:56:07.383: IPv6 DHCP: Sending INFORMATION-REQUEST to FF02::1:2 on GigabitEthernet0/2.500
*Aug 22 15:56:07.383: IPv6 DHCP: detailed packet contents
*Aug 22 15:56:07.383: src FE80::201:11FF:FE11:2222
*Aug 22 15:56:07.383: dst FF02::1:2 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.383: type INFORMATION-REQUEST(11), xid 7387384
*Aug 22 15:56:07.383: option ELAPSED-TIME(8), len 2
*Aug 22 15:56:07.383: elapsed-time 0
*Aug 22 15:56:07.383: option CLIENTID(1), len 10
*Aug 22 15:56:07.383: 00030001442B035DFF80
*Aug 22 15:56:07.383: option ORO(6), len 6
*Aug 22 15:56:07.383: DNS-SERVERS,DOMAIN-LIST,INFO-REFRESH
*Aug 22 15:56:07.383: IPv6 DHCP: DHCPv6 changes state from IDLE to
INFORMATION-REQUEST (STATELESS) on GigabitEthernet0/2.500
*Aug 22 15:56:07.385: IPv6 DHCP: Received REPLY from FE80::227:DFF:FE4E:D562 on GigabitEthernet0/2.500
*Aug 22 15:56:07.385: IPv6 DHCP: detailed packet contents
*Aug 22 15:56:07.385: src FE80::227:DFF:FE4E:D562 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.385: dst FE80::201:11FF:FE11:2222 (GigabitEthernet0/2.500)
*Aug 22 15:56:07.385: type REPLY(7), xid 7387384
*Aug 22 15:56:07.385: option SERVERID(2), len 10
*Aug 22 15:56:07.385: 0003000100270D4ED500
*Aug 22 15:56:07.385: option CLIENTID(1), len 10
*Aug 22 15:56:07.385: 00030001442B035DFF80
*Aug 22 15:56:07.385: option DNS-SERVERS(23), len 16
*Aug 22 15:56:07.385: 1818::1818
*Aug 22 15:56:07.385: IPv6 DHCP: Adding server FE80::227:DFF:FE4E:D562
*Aug 22 15:56:07.385: IPv6 DHCP: Processing options
* Aug 22 15:56:07.385: IPv6 DHCP: Configuring DNS server 1818::1818 <<<<<<<<<<
*Aug 22 15:56:07.385: IPv6 DHCP: DHCPv6 changes state from
INFORMATION-REQUEST to IDLE (REPLY_RECEIVED) on GigabitEthernet0/2.500
client(config-subif)#
client(config-subif)#
client(config-subif)#
*Aug 22 15:56:10.385: DEBUG_SWITCH:ARP 64.64.64.3 64.64.64.1
*Aug 22 15:56:10.385: DEBUG_SWITCH:OFP Roaming 64.64.64.1 observed
*Aug 22 15:56:11.427: %DHCP-6-ADDRESS_ASSIGN: Interface
GigabitEthernet0/2.500 assigned DHCP address 64.64.64.3, mask
255.255.255.0, hostname client
client(config-subif)#
client(config-subif)#
Use the below command to view the DNS info received:
client#show ipv6 dhcp interface g0/2.500
GigabitEthernet0/2.500 is in client mode
Prefix State is IDLE (0)
Information refresh timer expires in 23:53:18
Address State is IDLE
List of known servers:
Reachable via address: FE80::227:DFF:FE4E:D562
DUID: 0003000100270D4ED500
Preference: 0
Configuration parameters:
DNS server: 1818::1818 <<<<<<<<<<<<<<<<<<
Information refresh time: 0
Prefix Rapid-Commit: disabled
Address Rapid-Commit: disabled
client#
Configuring CentOS
Below commands would be useful while configuring broadhop:
Edit interface IP address ==> vi /etc/sysconfig/network-scripts/ifcfg-eth0
Restart NIC ==> service network restart
Replace default route ==> ip route replace default via 10.104.99.1 dev eth0
Bring down an interface ==> ifdown eth0
Bring UP an interface ==> ifup eth0
Add persistent routes by editing the file @ /etc/sysconfig/network-scripts/route-eth0 and the do "service network restart"
View routing table ==> route -n
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