On Wednesday, December 17, 2014 4:10:37 PM UTC+5:30, Krishna Chaitanya wrote: > > Hi All, > > We are working on p2p connection using android 4.4.2-r2 branch along with > 3rd party devices. > We have seen disconnection during long run tests randomly and all can be > attributed to DHCP renewal timing out. > The DHCP REQ is received by the server and DHCP ACK is being sent, but its > logs over the wifi connection due to some interference. > > In the current framework we have only one try at the DHCP renewal process > with a timeout of 30, which is not good for a wifi connection as single > packet loss is expected. > > As per RFC 2131 we should follow the below process for DHCP renewal. > > Per "Figure 5: State-transition diagram for DHCP clients" and in "4.4.5 > Reacquisition and expiration" > T1 expires: Start DHCP renew, moves to RENEW state > if success > Resets T1, T2 > moves to BOUND state from RENEW > if fails: (If no DHCPACK arrives before time T2) > If T2 expires, move to REBOUND state. > > Even the conditions for retrying DHCP request are put down under "SHOULD". > > >> >> >> >> * In both RENEWING and REBINDING states, if the client receives no >> response to its DHCPREQUEST message, the client SHOULD wait one-half of the >> remaining time until T2 (in RENEWING state) and one-half of the remaining >> lease time (in REBINDING state), down to a minimum of 60 seconds, before >> retransmitting the DHCPREQUEST message.* > > > So we need to change the dhcp_do_request_renew to accomodate these changes, > so that DHCP is handled well befroe pronouncing the peer as DEAD especially > over wifi connections. > > > I can submit a patch if we agree on these things. > > > Regards, > > Chaitanya T K. > > >
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