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mipv6: complete a first home registration in a single Binding Update #1134

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mipv6: complete a first home registration in a single Binding Update #1134

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2e9fc02
mipv6: fix: apply the first-registration Binding Update retransmissio…
adamgeorge309 Aug 19, 2026
f513057
mipv6: fix: set InitialBindackTimeoutFirstReg to the RFC value of 1.5 s
adamgeorge309 Aug 19, 2026
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11 changes: 10 additions & 1 deletion src/inet/networklayer/ipv6/Mipv6InterfaceData.h
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Expand Up @@ -31,11 +31,20 @@ namespace inet {
#define MIPv6_MAX_UPDATE_RATE 3 // times
#define MIPv6_PREFIX_ADV_RETRIES 3 // retransmissions
#define MIPv6_PREFIX_ADV_TIMEOUT 3 // seconds
#define MIPv6_INITIAL_BINDACK_TIMEOUT_FIRST 1 // seconds
#define MIPv6_MAX_RR_BINDING_LIFETIME 420 // seconds
#define MIPv6_MAX_HA_BINDING_LIFETIME 3600 // seconds (1 hour)
/***************END of RFC 3775 Protocol Constants*****************************/

/*********RFC 3775: Section 13 Protocol Configuration Variables****************/
// InitialBindackTimeoutFirstReg is the initial Binding Update retransmission
// timeout of a home registration for which the mobile node holds no binding
// yet. RFC 3775 and RFC 6275 derive its 1.5 second default as 1.5 times
// RetransTimer (RFC 4861) times DupAddrDetectTransmits (RFC 4862), so that the
// timer outlasts the Duplicate Address Detection that the home agent performs
// before it acknowledges such a registration.
#define MIPv6_INITIAL_BINDACK_TIMEOUT_FIRST 1.5 // seconds
/*********END of RFC 3775 Protocol Configuration Variables*********************/

/**
* Mobile IPv6 (RFC 3775) per-interface data: the Mobile Node's home address and
* home agent, plus the MIPv6 host protocol constants. Attached to a
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14 changes: 11 additions & 3 deletions src/inet/networklayer/mipv6/Mipv6.cc
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Expand Up @@ -412,13 +412,21 @@ void Mipv6::createBUTimer(const Ipv6Address& buDest, NetworkInterface *ie, const
If the mobile node is sending a Binding Update and does not have
an existing binding at the home agent, it SHOULD use
InitialBindackTimeoutFirstReg (see Section 13) as a value for the
initial retransmission timer.*/
if (!bul->isInBindingUpdateList(buDest))
initial retransmission timer. This long retransmission interval
will allow the home agent to complete the Duplicate Address
Detection procedure mandated in this case*/
// hasActiveBinding() is the test the RFC describes. A Binding Update List entry
// exists from the moment a Binding Update is attempted -- the createBUTimer()
// overload above creates one through fetch() -- so its mere presence says nothing
// about whether the home agent holds a binding. Only a home registration makes the
// home agent run Duplicate Address Detection, so a first Binding Update sent to a
// correspondent node keeps the shorter INITIAL_BINDACK_TIMEOUT.
if (homeRegistration && !bul->hasActiveBinding(buDest))
buIfEntry->ackTimeout = ie->getProtocolData<Mipv6InterfaceData>()->_getInitialBindAckTimeoutFirst(); // the backoff constant gets initialised here
/*Otherwise, the mobile node should use the specified value of
INITIAL_BINDACK_TIMEOUT for the initial retransmission timer.*/
else
buIfEntry->ackTimeout = ie->getProtocolData<Mipv6InterfaceData>()->_getInitialBindAckTimeout(); // if there's an entry in the BUL, use different value
buIfEntry->ackTimeout = ie->getProtocolData<Mipv6InterfaceData>()->_getInitialBindAckTimeout();

buIfEntry->homeRegistration = homeRegistration;

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6 changes: 3 additions & 3 deletions tests/fingerprint/examples.csv
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Expand Up @@ -380,9 +380,9 @@
/examples/manetrouting/multiradio/, -f omnetpp.ini -c MultiRadio -r 0, 20s, ec17-5cc2/tplx;55f5-0894/~tNl, PASS, wireless adhoc Ipv4
/examples/manetrouting/multiradio/, -f omnetpp.ini -c SingleRadio -r 0, 20s, 85a0-51b8/tplx;c07a-44e1/~tNl;3aa0-49ed/tyf, PASS, wireless adhoc Ipv4

/examples/ipv6/mipv6/, -f omnetpp.ini -c Handover -r 0, 70s, 19b8-20a4/tplx;b378-071d/~tNl;d358-e3bb/~tND;44ef-1a45/tyf, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c RouteOptimizationTwoCNs -r 0, 60s, 3f0c-078d/tplx;04e1-1f03/~tNl;4199-2b15/~tND;ed3e-17fa/tyf, PASS, wireless EthernetMac
/examples/ipv6/mipv6roaming/, -f omnetpp.ini -c Roaming -r 0, 70s, 0798-40c2/tplx;a682-8d0e/~tNl;cdb7-1b34/~tND;afae-2b3c/tyf, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c Handover -r 0, 70s, 1b65-9399/tplx;7c59-82c1/~tNl;8fe2-6dff/~tND;294d-c189/tyf, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c RouteOptimizationTwoCNs -r 0, 60s, a792-7cff/tplx;d858-66a6/~tNl;4f74-d139/~tND;6826-7aa6/tyf, PASS, wireless EthernetMac
/examples/ipv6/mipv6roaming/, -f omnetpp.ini -c Roaming -r 0, 70s, 96e7-53b1/tplx;94b5-af90/~tNl;d72a-de62/~tND;89c6-1d0f/tyf, PASS, wireless EthernetMac
/examples/ipv6/pmipv6/, -f omnetpp.ini -c General -r 0, 60s, f614-da0d/tplx;8b55-7191/~tNl;b490-dc09/~tND;0277-d784/tyf, PASS, wireless EthernetMac

/examples/mobility/, -f omnetpp.ini -c AnsimMobility -r 0, 10000s, 72f8-5c0b/tplx;0000-0000/~tNl;0000-0000/~tND;7dd1-18eb/tyf, PASS,
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6 changes: 3 additions & 3 deletions tests/fingerprint/mipv6-refactoring.csv
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Expand Up @@ -8,9 +8,9 @@
# empty-shim step, which kept these fingerprints bit-for-bit identical.

# MIPv6 example — the primary test
/examples/ipv6/mipv6/, -f omnetpp.ini -c Handover -r 0, 70s, aa29-a8c5/~tNlb, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c RouteOptimizationTwoCNs -r 0, 60s, 068b-23aa/~tNlb, PASS, wireless EthernetMac
/examples/ipv6/mipv6roaming/, -f omnetpp.ini -c Roaming -r 0, 70s, c8dc-27c2/~tNlb, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c Handover -r 0, 70s, bc88-95b3/~tNlb, PASS, wireless EthernetMac
/examples/ipv6/mipv6/, -f omnetpp.ini -c RouteOptimizationTwoCNs -r 0, 60s, abae-e24b/~tNlb, PASS, wireless EthernetMac
/examples/ipv6/mipv6roaming/, -f omnetpp.ini -c Roaming -r 0, 70s, 1d35-5070/~tNlb, PASS, wireless EthernetMac

# IPv6 examples
# MLD example — new PASS row; ~tNl locks the MLD Report/Query/Done/MAS-Query packet exchange (traffic+lengths);
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