IP Version 6

Ø Overview & Concepts (power point)

Ø Major Programming Changes

Ø TCP Unicast Examples

Ø UDP Unicast Examples

Ø Sctp Examples

Ø Multicast Example

ê Major Programming Changes

struct sockaddr_in6 addr;

socket(AF_INET6, ..);

addr.sin6_family = AF_INET6;

addr.sin6_port = htons(port)

addr.sin6_addr = in6addr_any;

OR

inet_pton(AF_INET6, “specific_ipv6address”, &addr.sin6_addr);

No changes for other calls: listen, accept, connect, send, recv, etc.

The following examples will run perfectly among

antares and capella and procyon:

% hostname

antares

% ifconfig -a

lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1

inet 127.0.0.1 netmask ff000000

bge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2

inet 128.82.4.98 netmask fffffe00 broadcast 128.82.5.255

sppp0: flags=10010008d1<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST,IPv4,FIXEDMTU> mtu 1500 index 3

inet 192.168.254.2 --> 192.168.254.1 netmask ffffff00

lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1

inet6 ::1/128

bge0: flags=202004841<UP,RUNNING,MULTICAST,DHCP,IPv6,CoS> mtu 1500 index 2

inet6 fe80::214:4fff:fe3a:8d85/10

% hostname

capella

% ifconfig -a

lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1

inet 127.0.0.1 netmask ff000000

bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2

inet 128.82.4.118 netmask fffffe00 broadcast 128.82.5.255

lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1

inet6 ::1/128

bge0: flags=2004841<UP,RUNNING,MULTICAST,DHCP,IPv6> mtu 1500 index 2

inet6 fe80::221:28ff:fe57:a8/10

% hostname

procyon

% ifconfig -a

lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1

inet 127.0.0.1 netmask ff000000

bge0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2

inet 128.82.4.170 netmask fffffe00 broadcast 128.82.5.255

lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1

inet6 ::1/128

bge0: flags=2004841<UP,RUNNING,MULTICAST,DHCP,IPv6> mtu 1500 index 2

inet6 fe80::221:28ff:fe57:3b8/10

ê TCP Unicast Examples

Daytime Servers and Clients

· Server IPv4:  s4

· Server IPv6:  s6

· Client IPv4:  c4

· Client IPv6:  c6

Examples of possible  scenarios:

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

Use tcpdump to observe the exchanged messages (assume you use port 10313):

% sudo tcpdump -N -t | grep 10313

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

% s4 10313&
% c4   128.82.4.210 10313

% c6 fe80::203:baff:fe2a:67ff 10313

connect error: Connection refused
% c6    ::ffff:128.82.4.210 10313

% s6 10313&
% c4   128.82.4.210 10313

% c6    fe80::203:baff:fe2a:67ff 10313
% c6    ::ffff:128.82.4.210 10313

In general:

For IPv6 client to talk to IPv4 server it should use ::ffff:ip4

ê 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

ê Sctp Examples

Daytime Servers and Clients

DayTimeXYSctpZ :

X (Server/Client)

Y (4/6)

Z (S/Q)

ü Server IPv4 Stream:  DayTimeServer4SctpS

ü Server IPv6 Stream:  DayTimeServer6SctpS

ü Client IPv4 Stream:  DayTimeClient4SctpS

ü Client IPv6 Stream:  DayTimeClient6SctpS

ü Server IPv4 Sequence Packet:  DayTimeServer4SctpQ

ü Server IPv6 Sequence Packet:  DayTimeServer6SctpQ

ü Client IPv4 Sequence Packet:  DayTimeClient4SctpQ

ü Client IPv6 Sequence Packet:  DayTimeClient6SctpQ

Examples of possible  scenarios

(match 4 servers & 4 clients): 16 cases

ê 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