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Martin Hope
hagrawal
Asked: 2016-06-24 13:41:24 +0800 CST
  • -1

I have a Linux box and I know I can get the list of IP addresses assigned to that box using following command /sbin/ifconfig -a but how to I get the list of hostnames / DNS for that Linux box using single command?

Why I asking this is because using /sbin/ifconfig -a I see that there are ~6 ethernets connected to it and in those 4 are active. Now, all those have different IP addresses, so I have 4 different IP addresses for my Linux box (please correct me if I am wrong here ??). Now, my Weblogic application server has defined listen address as, lets say abc.fb.us and xyz.fb.us etc. Now when I ping each hostname (should I call abc.fb.us as hostname or DNS or alias ??) then I get some IP address which is listed when I do ifconfig.

I know I can do nslookup 172.22.33.11 and I will get abc.fb.us, assuming that's the IP address of abc.fb.us.

But I want to get a list of hostnames using single command, much like the way I got list of IP address.

I have checked my /etc/hosts and it doesn't have abc.fb.us, xyz.fb.us etc. so clearly there is some other way these names are configured and how do I get all the hostnames?

linux ip-address hostname linux-networking
Martin Hope
hagrawal
Asked: 2016-03-08 13:41:32 +0800 CST
  • 0

I want to establish SSL connectivity between 2 servers, and I understood that I need to install the SSL certificate of server A into server B's Java keystore and vice-versa. So, that server A can call HTTPS URL of server B and vice-versa.

But below are questions for which I couldn't find answers:

  • If server A wants to call HTTPS URL of server B, then is it necessary to install the SSL certificate of server B or if server B's certificate's signing CA certificate is present in my Java keystore then no need to install server B's certificate? I think finally signing CA's certificate is checked if it is present in my keystore then all well.
  • I have infastructure configuration like this - LB -> Apache -> WL. Now, suppose SSL termination is happening at Apache, and then Apache is reverse proxy'ing to Weblogic, now it is calling HTTPS URL of WL. I know that I can specify Apache's SSL certificate using SSLCertificateFile directive but how would SSL certificate of WL will be validated at Apache's end because Apache doesn't have any keystore like Java keystore.
ssl
Martin Hope
hagrawal
Asked: 2015-08-14 10:34:23 +0800 CST
  • 1

We have Weblogic application server. Whenever a web browser sent a request, as part of tunnel creation process, it will send a list of preferred cipher suites.

Questions:

  1. How do I know which is the cipher suite or default cipher selected by WL server? I know I can use Fiddler to get that details; also I can right click on the browser HTTPS lock icon and get it. But I want to know from Weblogic server's end that which Cipher suit was selected, is it defined in some Weblogic environment .sh file?.

  2. Is there any way to change Cipher priority in Weblogic? I did some research and could find - Dweblogic.security.SSL.Ciphersuites=TLS_RSA_WITH_AES_256_CBC_SHA256".

  3. What happens if I configure Weblogic to use above mentioned Cipher, and this is not present in the cipher suit list sent by browser? My thought is that tunnel establishment will fail and some error like connection refused or failed will be shown to client/browser.

I would be much obliged if these answers can also be provided from Apache's perspective.

weblogic