Networking

Networking Topics

• Blackjack II Internet Connection Sharing
• Cable Modems
• DHCP Options
• DSL Modems
• Mikrotik
• Mikrotik: DHCP Options
• Tcpdump
• Wireless

IP Subnet Calculators

Subnets - CIDR - Wildcard

Wildpackets IP Subnet Calculator

Cisco DHCP Server

DHCP will run on whatever interface has an IP address in the service network.

!
ip dhcp pool local-network
   network 192.168.1.0 255.255.255.0
   domain-name network.local
   dns-server 69.18.99.19 69.18.99.20
   default-router 192.168.1.1
   lease 7
!
ip dhcp excluded-address 192.168.1.1
!

Cisco NTP

ntp server 129.6.15.28 prefer
ntp server 129.6.15.29

You can also specify the interface to use the source IP from:

conf t
ntp server 129.6.15.28 prefer source serial 0
ntp server 129.6.15.29 source serial 0
exit
wr me
sh ntp stat

conf t
ntp server 129.6.15.28 prefer source serial 0/0
ntp server 129.6.15.29 source serial 0/0
exit
wr me
sh ntp stat

conf t
ntp server 129.6.15.28 prefer source FastEthernet 0
ntp server 129.6.15.29 source FastEthernet 0
exit
wr me
sh ntp stat

conf t
ntp server 129.6.15.28 prefer source FastEthernet 0/0
ntp server 129.6.15.29 source FastEthernet 0/0
exit
wr me
sh ntp stat

conf t
ntp server 129.6.15.28 prefer source Ethernet 0
ntp server 129.6.15.29 source Ethernet 0
exit
wr me
sh ntp stat

conf t
ntp server 129.6.15.28 prefer source Ethernet 0/0
ntp server 129.6.15.29 source Ethernet 0/0
exit
wr me
sh ntp stat

MSS and MTU

Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC

MSS numbers are 40 bytes smaller than the MTU numbers because MSS is just the TCP data sie, which does not include the 20 byte IP header and the 20 byte TCP header.

Redback Documentation

http://www.frameip.com/forum/publication-de-piece-jointe/redback/