05-01-2018 11:18 PM - edited 03-18-2019 02:05 PM
Hi Guys,
Is there someone who can explain in detail how the Expressway-E static NAT functionality works?, I have read the documentation (deployment and administration guides) but its is yet unclear for me; I do not understand, how this works, if this is configured with or without additional configuration in the ASA firewall and stuff like that.
Thanks in advance,
best regards,
05-04-2018 04:31 PM
Hi @david.alfaro,
first of all, the best document for this is: VCS Basic Configuration (check the Background Information item).
The Static NAT is important to make EXP-E to change the IP Addr inside the SIP Payload ... ASA changes the IP Addr of the SIP Header.
Packet header: Source IP: 10.0.10.2 Destination IP: 64.100.0.20 SIP payload: INVITE sip: 64.100.0.20 SIP/2.0 Via: SIP/2.0/TLS 10.0.10.2:5061 Via: SIP/2.0/TLS 10.0.20.3:55938 Call-ID: 20ec9fd084eb3dd2@127.0.0.1 CSeq: 100 INVITE Contact: <sip:EndpointA@10.0.20.3:55938;transport=tls> From: "Endpoint A" <sip:EndpointA@cisco.com>;tag=9a42af To: <sip: 64.100.0.20> Max-Forwards: 70 Content-Type: application/sdp Content-Length: 2825 v=0 o=tandberg 1 2 IN IP4 10.0.10.2 s=- c=IN IP4 10.0.10.2 b=AS:2048 Packet header changed by the Firewall: Source IP: 64.100.0.10 Destination IP: 64.100.0.20 SIP payload no changed by EXP-E (EXP-E with NO Static NAT): INVITE sip:64.100.0.20 SIP/2.0 Via: SIP/2.0/TLS 10.0.10.2:5061 Via: SIP/2.0/TLS 10.0.20.3:55938 Call-ID: 20ec9fd084eb3dd2@127.0.0.1 CSeq: 100 INVITE Contact: <sip:EndpointA@10.0.20.3:55938;transport=tls> From: "Endpoint A" <sip:EndpointA@cisco.com>;tag=9a42af To: <sip:64.100.0.20> Max-Forwards: 70 Content-Type: application/sdp Content-Length: 2825 v=0 s=- c=IN IP4 10.0.10.2 b=AS:2048 Packet header changed by the Firewall: Source IP: 64.100.0.10 Destination IP: 64.100.0.20 SIP payload changed by EXP-E with Static NAT: INVITE sip: 64.100.0.20 SIP/2.0 Via: SIP/2.0/TLS 10.0.10.2:5061 Via: SIP/2.0/TLS 10.0.20.3:55938 Call-ID: 20ec9fd084eb3dd2@127.0.0.1 CSeq: 100 INVITE Contact: <sip:EndpointA@10.0.20.3:55938;transport=tls> From: "Endpoint A" <sip:EndpointA@cisco.com>;tag=9a42af To: <sip: 64.100.0.20> Max-Forwards: 70 Content-Type: application/sdp Content-Length: 2825 v=0 s=- c=IN IP4 64.100.0.10 b=AS:2048
Hope this helps,
Marcelo Morais
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