I have identified and resolved LAN IP address conflicts and solved the issue of connecting to SAP server over Fortigate firewall site to site IPsec VPN tunnel on 3 Nov 2022 Thursday

Subject: I have identified and resolved LAN IP address conflicts and solved the issue of connecting to SAP server over Fortigate firewall site to site IPsec VPN tunnel on 3 Nov 2022 Thursday


Good day from Singapore,


I have identified and resolved LAN IP address conflicts and solved the issue of connecting to SAP server over Fortigate firewall site to site IPsec VPN tunnel on 3 Nov 2022 Thursday.


HQ LAN network 192.168.44.0

Branch Office LAN network 192.168.42.0


JW had reported she couldn't access shared folders on the Windows Server Domain Controller in their branch office. Her office desktop computer has both LAN and Wi-Fi connection. I remoted into her office computer and discovered that there are IP address conflicts in their Local Area Network (LAN) by running Advanced IP Scanner on the Domain Controller. There is another device with the same IP address but different MAC address. To address the issue, I have changed JW's IP address from 192.168.42.63 to 192.168.42.201.


For SL, her office desktop computer also has the same IP address with a HP ProCurve Network Switch 2510G-24 which has a different MAC address. To address the issue, I have changed SL's IP address from 192.168.42.62 to 192.168.42.202.


The IP addresses of their office computers are configured statically, and not managed using DHCP auto configuration.


My client had another issue. They could not connect to the SAP server on the HQ LAN network. To address this issue, I have accessed their Fortigate firewall and restarted (bring down and then bring up) the site to site IPsec VPN tunnel. This simple solution solved the SAP connection issue.


My client's branch office is located near Orchard Road, Singapore.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individual in Singapore

Blogs:

https://tdtemcerts.blogspot.com

https://tdtemcerts.wordpress.com




REFERENCES

============


[1] https://sourceforge.net/p/net-snmp/mailman/message/37731295/


[2] https://www.mail-archive.com/net-snmp-users@lists.sourceforge.net/msg33433.html


[3] https://marc.info/?l=net-snmp-users&m=166770559115766&w=2


[4] https://markmail.org/search/?q=teo%20en%20ming#query:teo%20en%20ming%20order%3Adate-backward+page:1+mid:4mnt4vetnxmeb4xy+state:results

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