top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration

LTE - What will be destination address for DL packets that comes through GI interface?

+3 votes
74 views

What will be destination address for DL packets that comes through GI interface?
Is it PGW or MS address ?

posted Nov 30, 2013 by sivanraj

Share this question
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

1 Answer

+1 vote

Not just a LTE case even same applies to UMTS also.

Say UE is trying to access google.com now google.com supplies the result of the search i.e. the downlink data. Now assume PGW/GGSN has assigned the address 10.1.1.1(private IP) to the UE, PGW address is 172.26.10.1 and Google.com address is 175.25.12.1

Now the packet with source IP as 10.1.1.1 and destination as google.com will reach to PGW (via LTE/UMTS network), now at PGW or any adjucent node 10.1.1.1 will be natted to a public IP which is assigned to to operator say 192.10.1.1 and will be forwarded to google.com, google.com will send the reply to the 192.10.1.1 as destination which will reach at PGW which will be reverse natted to 10.1.1.1 and Mobile network will drop it at UE.

answer Nov 30, 2013 by Salil Agrawal
nice Salil and can you also clarify how DL routed from Google server to 192.10.1.1 and 172.26.10.1.
For the google.com server packet is coming from 192.10.1.1 so it will reply back to 192.10.1.1 which will be dropped to PGW because IP network is configured to drop the packet with dest address as 192.10.1.1 at the PGW.
thanks......
Similar Questions
0 votes

There is no security at eGTP level . Does the IP-sec sufficient to achieve the security for eGTP messages ?

+1 vote

I read that when PGW's packet handler process maps an IP packet to a EPS bearer, it do DSCP marking.
And I also read DSCP marking is associated QCI of a bearer. How DSCP marking will help out to get maintained QoS of a bearer.

+2 votes

How P GW will select the S GW for Incoming Packet?
Consider two conditions
1. UE is in idle mode.
2. UE is in ECM CONNECTED and ECM IDLE.

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...