SCTP multihome in wireless networks

[Bruno Sousa]

Dears.

Running the SCTP multihomed example of INETMANET, everythings works
correct.
Nevertheless this scenario is wired.

I wonder If anyone has achieved to use SCTP multihomed in wireless
scenarios.
I've not been able to do, as the SCTPClient never gets associated with
the SCTPServer. I get the error "VTag is incorrect..." from the
SCTPAssociationRcvMessage class, and the T1_INIT timer is 'postponed'.

Thanks In advance.
Bruno

[Irene Rüngeler]

Hey Bruno,

I haven't tested SCTP in wireless scenarios yet, but I've written the SCTP simulation and, therefore, I am familiar with the SCTP code. 

Could you send me your example, so I can see, what is wrong?

Best regards,

Irene

[Bruno Sousa]

Hi Irene

Thanks for looking into the code.

Bellow is the code of NED file, configuration and routing files. I
must also add that I've used the version of INETMANET as I wanted a
multi-interface wireless node.

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
NED
File :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

import inet.nodes.wireless.WirelessAP;
import inet.nodes.wireless.WirelessHost;
import inet.nodes.inet.Router;
import inet.examples.ethernet.lans.cable;
import inet.nodes.wireless.WirelessAPWithEth;
import inet.transport.sctp.SCTP;
import inet.applications.sctpapp.SCTPApp;
import inet.nodes.inet.StandardHost;
import ned.DatarateChannel;

import inet.nodes.wireless.WirelessHostSimplified;
import inet.linklayer.ieee80211.Ieee80211NicSTA;
import inet.world.ChannelControl;
import inet.linklayer.radio.Radio;
import inet.nodes.wireless.WirelessHostMultiRadio;
import inet.world.ChannelControlExtended;
import inet.mobility.LinearMobility;
import inet.nodes.wireless.WirelessRouter;
//
// TODO auto-generated module
//
network Scenario
{
//@display("b=600,200,rect");
parameters:
bool testing = default(false);
bool logverbose = default(false);

types:

channel AP_Rt_con extends DatarateChannel
{
delay = 10ms;
// datarate = 10 Mbps;
}

channel Rt_Rt_con extends DatarateChannel
{
delay = 100ms;
datarate = 5 Mbps;
}

channel Rt_Host_con extends DatarateChannel
{
delay = 10ms;
datarate = 10 Mbps;
}

submodules:
R1d: Router {
@display("p=25,150");
routingFile = "R1d.mrt";
}
R2d: Router {
@display("p=225,150");
routingFile = "R2d.mrt";
}
R3d: Router {
@display("p=425,150");
routingFile = "R3d.mrt";
}
R4d: Router {
@display("p=625,150");
routingFile = "R4d.mrt";
}

Dst: StandardHost {
@display("p=86,75");
routingFile = "Dst.mrt";
IPForward = false;
}

channelControl: ChannelControlExtended {
@display("p=25,18");
coreDebug = false;
playgroundSizeX = 650;
playgroundSizeY = 400;
numChannels = 5;
}

Src: myWirelessHost {
@display("p=30,272");
numRadios = 4;
routingFile = "Src.mrt";
IPForward = false;
}

R1s: WirelessRouter {
@display("p=24,200");
routingFile = "R1s.mrt";
mgmtType = default("Ieee80211MgmtAP");

}
R2s: WirelessRouter {
@display("p=225,200");
routingFile = "R2s.mrt";
mgmtType = default("Ieee80211MgmtAP");
}

R3s: WirelessRouter {
@display("p=425,200");
routingFile = "R3s.mrt";
mgmtType = default("Ieee80211MgmtAP");
}

R4s: WirelessRouter {
@display("p=625,200");
routingFile = "R4s.mrt";
mgmtType = default("Ieee80211MgmtAP");
}
connections:
//Router to Router Connections
//R1S.pppg++ <--> Rt_Rt_con <--> R1d.pppg++;
R1s.pppg++ <--> Rt_Rt_con <--> R1d.pppg++;
R2s.pppg++ <--> Rt_Rt_con <--> R2d.pppg++;
R3s.pppg++ <--> Rt_Rt_con <--> R3d.pppg++;
R4s.pppg++ <--> Rt_Rt_con <--> R4d.pppg++;

//R1d.ethg++ <--> Rt_Host_con <--> Dst.ethg++;
R1d.pppg++ <--> Rt_Host_con <--> Dst.pppg++;
R2d.pppg++ <--> Rt_Host_con <--> Dst.pppg++;
R3d.pppg++ <--> Rt_Host_con <--> Dst.pppg++;
R4d.pppg++ <--> Rt_Host_con <--> Dst.pppg++;

}



module myWirelessHost extends WirelessHostMultiRadio
{
parameters:
int numSctpApps = default(0);
string sctpAppType = default("n/a");

@display("i=old/laptop3");


gates:


submodules:
sctp: SCTP {
@display("p=459,132;i=block/wheelbarrow");
}
sctpApp[numSctpApps]: <sctpAppType> like SCTPApp {
@display("p=459,51");
}



connections allowunconnected:


for i=0..numSctpApps-1 {
sctpApp[i].sctpOut --> sctp.from_appl++;
sctp.to_appl++ --> sctpApp[i].sctpIn;
}

sctp.to_ip --> networkLayer.sctpIn;
networkLayer.sctpOut --> sctp.from_ip;
}


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
omnetpp.ini :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
[General]
network = Scenario
cpu-time-limit = 3000s
sim-time-limit = 180s

# Set testing
Scenario.testing = true
Scenario.logverbose = true

# For Wired hosts
**.networkLayer.proxyARP = true
**.networkLayer.arp.cacheTimeout = 120s
**.networkLayer.arp.retryTimeout = 1s
**.networkLayer.arp.retryCount = 3
**.globalARP = false

# SEE: http://www7.informatik.uni-erlangen.de/~sommer/publications/pdf/sommer2007realistic.pdf
#Sets for wireless
**.channelControl.playgroundSizeX = 600
**.channelControl.playgroundSizeY = 400
**.channelControl.numChannels = 5
**.channelControl.alpha = 1.9 # def. 2 Path loss Coefficient
**.channelControl.carrierFrequency = 2.4GHz
**.channelControl.sat = -80dBm # def. -110
**.channelControl.pMax = 1.0mW


**.mac.maxQueueSize = 10
**.mac.bitrate = 11Mbps
**.radio.bitrate = 11Mbps
**.radio.transmitterPower = 1.0mW # other 70
**.radio.thermalNoise = -110dBm
**.radio.pathLossAlpha = 1.9 # def. 2
**.radio.sensitivity = -85dBm
**.radio.snirThreshold = 3dB # def 4dB
**.wlan.mgmt.numAuthSteps = 2 # 2 Open System, 4 WEP


#Settings for APs.
**.R1s.wlan.mgmt.ssid ="netS1"
**.R1s.wlan.mac.address = "auto"
**.R1s.wlan.mac.maxQueueSize = 100
**.R1s.wlan.mac.rtsThresholdBytes = 2346B
**.R1s.wlan.mac.bitrate = 11Mbps
**.R1s.wlan.mac.retryLimit = -1
**.R1s.wlan.mac.cwMinData = -1
**.R1s.wlan.mac.cwMinBroadcast = -1
**.R1s.wlan.mac.mtu = 1500
**.R1s.wlan.radio.channelNumber = 1
**.R1s.eth[0].address = "auto"
**.R1s.eth[0].txrate = 10Mbps
**.R1s.eth[0].mtu = 1500
#**.R1s.mobility.x = 25
#**.R1s.mobility.y = 160


#Settings for APs.
**.R2s.wlan.mgmt.ssid = "netS2"
**.R2s.wlan.mac.address = "auto"
**.R2s.wlan.mac.maxQueueSize = 100
**.R2s.wlan.mac.rtsThresholdBytes = 2346B
**.R2s.wlan.mac.bitrate = 11Mbps
**.R2s.wlan.mac.retryLimit = -1
**.R2s.wlan.mac.cwMinData = -1
**.R2s.wlan.mac.cwMinBroadcast = -1
**.R2s.wlan.mac.mtu = 1500
**.R2s.wlan.radio.channelNumber = 2
**.R2s.eth[0].address = "auto"
**.R2s.eth[0].txrate = 10Mbps
**.R2s.eth[0].mtu = 1500
#**.R2s.mobility.x = 50
#**.R2s.mobility.y = 160


#Settings for APs.
**.R3s.wlan.mgmt.ssid = "netS3"
**.R3s.wlan.mac.address = "auto"
**.R3s.wlan.mac.maxQueueSize = 100
**.R3s.wlan.mac.rtsThresholdBytes = 2346B
**.R3s.wlan.mac.bitrate = 11Mbps
**.R3s.wlan.mac.retryLimit = -1
**.R3s.wlan.mac.cwMinData = -1
**.R3s.wlan.mac.cwMinBroadcast = -1
**.R3s.wlan.mac.mtu = 1500
**.R3s.wlan.radio.channelNumber = 3
**.R3s.eth[0].address = "auto"
**.R3s.eth[0].txrate = 10Mbps
**.R3s.eth[0].duplexEnabled = true
**.R3s.eth[0].mtu = 1500
#**.R3s.mobility.x = 75
#**.R3s.mobility.y = 160

#Settings for APs.
**.R4s.wlan.mgmt.ssid = "netS4"
**.R4s.wlan.mac.address = "auto"
**.R4s.wlan.mac.maxQueueSize = 100
**.R4s.wlan.mac.rtsThresholdBytes = 2346B
**.R4s.wlan.mac.bitrate = 11Mbps
**.R4s.wlan.mac.retryLimit = -1
**.R4s.wlan.mac.cwMinData = -1
**.R4s.wlan.mac.cwMinBroadcast = -1
**.R4s.wlan.mac.mtu = 1500
**.R4s.wlan.radio.channelNumber = 4
**.R4s.eth[0].address = "auto"
**.R4s.eth[0].txrate = 10Mbps
**.R4s.eth[0].duplexEnabled = true
**.R4s.eth[0].mtu = 1500
#**.R4s.mobility.x = 100
#**.R4s.mobility.y = 160

#Conf of mobile node
**.Src.numTcpApps = 0
**.Src.numUdpApps = 0
**.Src.tcpAppType = "TcpBasicClientApp"
**.Src.udpAppType = "UDPApp"

**.Dst.numUdpApps = 0
**.Dst.udpAppType = "UDPApp"
**.Dst.numTcpApps = 0
**.Dst.tcpAppType = "TCPSinkApp"

**.Src.mobilityType = "LinearMobility" # TBD
#**.Src.mobilityType = "NullMobility" # TBD
**.Src.mobility.x = 20
**.Src.mobility.y = 280
#**.Src.mobility.x = -1
#**.Src.mobility.y = -1
**.Src.mobility.speed = 2mps
**.Src.mobility.angle = 0
**.Src.mobility.acceleration = 0
**.Src.mobility.updateInterval = 100ms

**.Src.wlan[*].mac.address="auto"
**.Src.wlan[*].agent.startingTime = 1s

**.Src.wlan[0].agent.default_ssid = "netS1"
**.Src.wlan[0].agent.channelsToScan = "1"
**.Src.wlan[0].radio.channelNumber = 1

**.Src.wlan[1].agent.default_ssid = "netS2"
**.Src.wlan[1].agent.channelsToScan = "2"
**.Src.wlan[1].radio.channelNumber = 2

**.Src.wlan[2].agent.default_ssid = "netS3"
**.Src.wlan[2].agent.channelsToScan = "3"
**.Src.wlan[2].radio.channelNumber = 3

**.Src.wlan[3].agent.default_ssid = "netS4"
**.Src.wlan[3].agent.channelsToScan = "4"
**.Src.wlan[3].radio.channelNumber = 4

# Optimized SCTP
**.sctp.pathMaxRetrans = 3
**.sctp.rtoMin = 0.020s
**.sctp.sackPeriod = 0.020s


# SCTP Traffic
**.Dst.numSctpApps = 1
**.Dst.sctpAppType = "SCTPServer"
**.Dst.sctpApp[0].address = ""
**.Dst.sctpApp[0].port = 66
**.Dst.sctpApp[0].numPacketsToReceivePerClient = 0
**.Dst.sctpApp[0].numPacketsToSendPerClient = 0
**.Dst.sctpApp[0].thinkTime = 0s
**.Dst.sctpApp[0].waitToClose = 0s
**.Dst.sctpApp[0].delayFirstRead = 0s


**.Src.numSctpApps = 1
**.Src.sctpAppType = "SCTPClient"
**.Src.sctpApp[0].address = ""
**.Src.sctpApp[0].connectAddress = "10.1.9.1"
**.Src.sctpApp[0].primaryPath = "10.1.9.1"
**.Src.sctpApp[0].connectPort = 66
**.Src.sctpApp[0].startTime = 5s
**.Src.sctpApp[0].numRequestsPerSession = 100
**.Src.sctpApp[0].requestLength = 1000
**.Src.sctpApp[0].thinkTime = 0s
**.Src.sctpApp[0].waitToClose = 0s

#**.Src.pingApp.destAddr = "10.1.9.1"
#**.Src.pingApp.srcAddr="10.1.1.1"
#**.Src.pingApp.packetSize=56B
#**.Src.pingApp.interval=1s
#**.Src.pingApp.hopLimit=32
#**.Src.pingApp.count=0
#**.Src.pingApp.startTime = uniform(10s,11s)
#**.Src.pingApp.printPing=true


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Src.mrt :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ifconfig:
# ethernet card (modelled by point-to-point link)
name: wlan0 inet_addr: 10.1.1.1 MTU: 1500 Metric: 1 BROADCAST
MULTICAST
name: wlan1 inet_addr: 10.1.2.1 MTU: 1500 Metric: 1 BROADCAST
MULTICAST
name: wlan2 inet_addr: 10.1.3.1 MTU: 1500 Metric: 1 BROADCAST
MULTICAST
name: wlan3 inet_addr: 10.1.4.1 MTU: 1500 Metric: 1 BROADCAST
MULTICAST

ifconfigend.

route:
#10.1.1.1 10.1.1.1 255.255.255.255 H 0 wlan0
10.1.9.0 10.1.1.254 255.255.255.0 G 0 wlan0

#10.1.2.1 10.1.2.1 255.255.255.255 H 0 wlan1
10.1.10.0 10.1.2.254 255.255.255.0 G 0 wlan1

#10.1.3.1 10.1.3.1 255.255.255.255 H 0 wlan2
10.1.11.0 10.1.3.254 255.255.255.0 G 0 wlan2

#10.1.4.1 10.1.4.1 255.255.255.255 H 0 wlan3
10.1.12.0 10.1.4.254 255.255.255.0 G 0 wlan3

#default: 10.1.1.254 0.0.0.0 G 0 wlan0
routeend.


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
R1s.mrt :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ifconfig:
# ethernet card (modelled by point-to-point link)
name: wlan inet_addr: 10.1.1.254 Mask: 255.255.255.0 MTU: 1500
Metric: 1 BROADCAST MULTICAST

# ethernet card (modelled by point-to-point link)
name: ppp0 inet_addr: 10.1.5.254 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST

ifconfigend.

route:
default: 10.1.5.253 0.0.0.0 G 0 ppp0
routeend.


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
R1d.mrt :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ifconfig:
# ethernet card (modelled by point-to-point link)
name: ppp1 inet_addr: 10.1.9.254 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST

# ethernet card (modelled by point-to-point link)
name: ppp0 inet_addr: 10.1.5.253 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST

ifconfigend.

route:
10.1.1.0 10.1.5.254 255.255.255.0 G 0 ppp0
routeend.


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Dst.mrt :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
ifconfig:
# ethernet card (modelled by point-to-point link)
name: ppp0 inet_addr: 10.1.9.1 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST
name: ppp1 inet_addr: 10.1.10.1 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST
name: ppp2 inet_addr: 10.1.11.1 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST
name: ppp3 inet_addr: 10.1.12.1 Mask: 255.255.255.0 MTU: 1500
Metric: 1 POINTTOPOINT MULTICAST

ifconfigend.

route:
#10.1.9.1 10.1.9.1 255.255.255.255 H 0 ppp0
10.1.1.0 10.1.9.254 255.255.255.0 G 0 ppp0

#10.1.10.1 10.1.10.1 255.255.255.255 H 0 ppp1
10.1.2.0 10.1.10.254 255.255.255.0 G 0 ppp1

#10.1.11.1 10.1.11.1 255.255.255.255 H 0 ppp2
10.1.3.0 10.1.11.254 255.255.255.0 G 0 ppp2

#10.1.12.1 10.1.12.1 255.255.255.255 H 0 ppp3
10.1.4.0 10.1.12.254 255.255.255.0 G 0 ppp3

#default: 10.1.9.254 0.0.0.0 G 0 ppp0
routeend.


I'm ommitting the routing configuration of the remaining routers,
namely R2, R3 and R4 and the 'logic' is the same as R1s and R1d.

Best Regards,
Bruno

[Irene Rüngeler]

Hi Bruno,

I could solve the problem with the VTag. 

In src/transport/sctp/SCTPMessage.cc, please change line 29 from 

this->setTag(0); to this->setTag(other.getTag());

Unfortunately, there is another problem now with an ARP request.

The SCTP handshake works fine. As all IP addresses are listed in the INET and INET-ACK chunk, HEARTBEATS are sent on all paths for confirmation. The message flow so far is:

** Event #2725  T=5.112704293153  Scenario.Dst.tcpdump, on `{ INIT}'

[5.113] 10.1.1.1.33658 > 10.1.9.1.66: numberOfChunks=1 VTag=0

INIT 

       1: INIT[InitiateTag=4117062540; a_rwnd=65535; OS=1; IS=17; InitialTSN=1000; Addresses=10.1.1.1,10.1.2.1,10.1.3.1,10.1.4.1]

** Event #2729  T=5.112704293153  Scenario.Dst.tcpdump, on `{ INIT_ACK}'

[5.113] 10.1.9.1.66 > 10.1.1.1.33658: numberOfChunks=1 VTag=4117062540

INIT_ACK 

       1: INIT_ACK[InitiateTag=2055555570; a_rwnd=65535; OS=1; IS=1; InitialTSN=2000; CookieLength=0; Addresses=10.1.9.1,10.1.10.1,10.1.11.1,10.1.12.1]

** Event #2875  T=5.335000500916  Scenario.Dst.tcpdump, on `{ COOKIE_ECHO}'

[5.335] 10.1.1.1.33658 > 10.1.9.1.66: numberOfChunks=1 VTag=2055555570

COOKIE_ECHO 

       1: COOKIE_ECHO[CookieLength=76]

** Event #2884  T=5.335000500916  Scenario.Dst.tcpdump, on `{ HEARTBEAT}'

[5.335] 10.1.9.1.66 > 10.1.1.1.33658: numberOfChunks=1 VTag=4117062540

HEARTBEAT 

       1: HEARTBEAT[InfoLength=12; time=5.335000500916]

** Event #2885  T=5.335000500916  Scenario.Dst.tcpdump, on `{ HEARTBEAT}'

[5.335] 10.1.10.1.66 > 10.1.2.1.33658: numberOfChunks=1 VTag=4117062540

HEARTBEAT 

       1: HEARTBEAT[InfoLength=12; time=5.335000500916]

** Event #2886  T=5.335000500916  Scenario.Dst.tcpdump, on `{ HEARTBEAT}'

[5.335] 10.1.11.1.66 > 10.1.3.1.33658: numberOfChunks=1 VTag=4117062540

HEARTBEAT 

       1: HEARTBEAT[InfoLength=12; time=5.335000500916]

** Event #2887  T=5.335000500916  Scenario.Dst.tcpdump, on `{ HEARTBEAT}'

[5.335] 10.1.12.1.66 > 10.1.4.1.33658: numberOfChunks=1 VTag=4117062540

HEARTBEAT 

       1: HEARTBEAT[InfoLength=12; time=5.335000500916]

** Event #2888  T=5.335000500916  Scenario.Dst.tcpdump, on `{ COOKIE_ACK}'

[5.335] 10.1.9.1.66 > 10.1.1.1.33658: numberOfChunks=1 VTag=4117062540

COOKIE_ACK 

       1: COOKIE_ACK 

Maybe it has something to do with the reachability of the routers. But I am not familiar with wireless networks and ARP. So please have a look at it yourself.

Best regards,

Irene

[Bruno Sousa]

Hi Irene

Thanks.
The issue with SCTP seems resolved.
The problem with ARP is related with the wireless settings. As the
HEARTBEAT message is to be received on the second link (R2s -> Src.wlan
[1]), this link is not established at this stage.

> > # SEE:http://www7.informatik.uni-erlangen.de/~sommer/publications/pdf/somme...

> ...
>
> read more »

[Bruno Sousa]

Sorry I did not complete the post.

Hi Irene

Thanks.
The issue with SCTP seems resolved.
The problem with ARP is related with the wireless settings. As the
HEARTBEAT message is to be received on the second link (R2s ->
Src.wlan [1]), this link is not established at this stage.

I need to find the correct wireless settings, so that I have (at the
SCTP association phase) the:
a) R1s -> Src.wlan[0] connected and R2s->Src.wlan[1] connected
b) or have the mobile host connected to all Wireless Routers
(R1s...R4s)

Neverthless option b), seems to me not realistic.

In any case, I found this behaviour somehow strange, as if the
WirelessRouter (R2s...R4s) detects that the mobile station is not
connected why is it trying to send packets to the same? I need to
perform more googling on this matter.
Can anyone suggest good links regarding the wireless coverage of nodes
in INET?

Thanks in advance.

Best Regards,
Bruno Sousa

> ...
>
> read more »

[Alfonso Ariza]

I have included this patch in INETMANET. It's possible to disable the ARP protocol in inetmanet

[Bruno Sousa]

Dear Alfonso

Thanks for including the feature in INETMANET.

Sorry the 'newbie' question: How can I disable ARP protocol in
INETMANET?

Thanks in advance,
Bruno Sousa

>   # SEE:http://www7.informatik.uni-erlangen.de/~sommer/publications/pdf/somme...

> ...
>
> read more »

[Alfonso Ariza]

In inet manet the ARP protocol has a parameter "globalARP" if you set this
parameter to true, the module will know all the mac address and doesn't need
to generate the ARP messages

--------------------------------------------------
From: "Bruno Sousa" <bxm...@gmail.com>
Sent: Monday, November 09, 2009 10:51 PM
To: "omnetpp" <omn...@googlegroups.com>

[Nasim]

Hi Bruno,

I am trying to run a simulation for wireless sctp-multihomed and have the same problem, I don't know why the wireless routers does not forward the packets to the wired router. Did you manage to find a way to solve this?

Best

Nasim 

[Moshen Sichani]

Hi Bruno

thanks for adding SCTP to INET and also thanks to Alfonso.

I have two small question and it would be great if you could provide me some help.

Have each interface in SCTP an independent routing file (in wireless)?

How can I see the links(paths) at each route from a client to a server?

Thanks in advance

Regards

Moshen