IP Version 6

Ø Overview & Concepts

Ø TCP Unicast Examples

Ø UDP Unicast Examples

Ø Sctp Examples

Ø Multicast Example

Ø TCP Unicast Examples

Daytime Servers and Clients

Ø Server IPv4:  s4

Ø Server IPv6:  s6

Ø Client IPv4:  c4

Ø Client IPv6:  c6

Examples of possible  scenarios:

% cd /home/cs779/stevens3rd.book/unpv13e/intro

Use tcpdump to observe the exchanged messages:

% sudo tcpdump -N -t | grep 1313

Run server on host something (IPv4: 128.82.4.210 & IPv6: fe80::203:baff:fe2a:67ff )

% s4 &
% c4   128.82.4.210

% c6 fe80::203:baff:fe2a:67ff

connect error: Connection refused
% c6    ::ffff:128.82.4.210

% s6 &
% c4   128.82.4.210

% c6    fe80::203:baff:fe2a:67ff
% c6    ::ffff:128.82.4.210

In general:

For IPv6 client to talk to IPv4 server it should use:

::ffff:ip4

Ø UDP Unicast Examples

Daytime Servers and Clients

Ø Server IPv4:  s4u

Ø Server IPv6:  s6u

Ø Client IPv4:  c4u

Ø Client IPv6:  c6u

Examples of possible  scenarios:

Similar to TCP above

Ø Sctp Examples

Daytime Servers and Clients

Ø Server IPv4 Stream:  DayTimeServer4SctpS

Ø Server IPv6 Stream:  DayTimeServer6SctpS

Ø Client IPv4 Stream:  DayTimeClient4SctpS

Ø Client IPv6 Stream:  DayTimeClient6SctpS

Ø Server IPv4 Sequence Packet:  DayTimeServer4SctpQ

Ø Server IPv6 Sequence Packet:  DayTimeServer6SctpQ

Ø Client IPv4 Sequence Packet:  DayTimeClient4SctpQ

Ø Client IPv6 Sequence Packet:  DayTimeClient6SctpQ

Examples of possible  scenarios

(match 4 servers & 4 clients): 16 cases

Ø Multicast Example

mcast6

IPv6 multicast addresses starts with ff.

Example: " ff80::203:baff:fe2a:6722"

Also you can use IPv4-mapped IPv6 addresses: ::ffff:224..1.1.22 

s = socket(AF_INET6,SOCK_DGRAM, 0);

joinGroup(s,” ::ffff:224..1.1.22 ”);

void joinGroup(int s, char *group)

{

struct sockaddr_in6 groupStruct;

struct ipv6_mreq mreq;

inet_pton(AF_INET6, group, &groupStruct.sin6_addr);

mreq.ipv6mr_multiaddr = groupStruct.sin6_addr;

mreq.ipv6mr_interface = INADDR_ANY;

setsockopt(s,IPPROTO_IPV6,IPV6_ADD_MEMBERSHIP,(char *) &mreq, sizeof(mreq));

}

Example:

% cd /home/cs779/public_html/mcast/mcast6

% mchat  0

% cd /home/cs779/public_html/mcast/mcast4

% mchat  0