Hi Eric, It should behave the same way. The socket client application will be assigned an ephemeral port.
On Fri, Jun 25, 2021 at 9:14 AM Eric Robinson <eric.robin...@psmnv.com> wrote: > I guess I may have answered this question for myself. At least I can > simulate it with ncat. Note that I have two ncat sessions open to the same > remote server using the same source port, but with different source IPs. > > [root@testserver ~]# netstat -antp|grep ncat > tcp 0 0 192.168.11.215:3456 192.168.10.59:9000 > ESTABLISHED 60946/ncat > tcp 0 0 192.168.10.58:3456 192.168.10.59:9000 > ESTABLISHED 60920/ncat > > Is there any reason why tomcat should not be expected to work the same > way? And when I say tomcat, I really mean libraries like the mysql odbc > connector that tomcat uses. > > > > -----Original Message----- > > From: Eric Robinson <eric.robin...@psmnv.com> > > Sent: Thursday, June 24, 2021 3:19 PM > > To: Tomcat Users List <users@tomcat.apache.org> > > Subject: Re-Use TCP Source Ports if the Socket is Unique? > > > > Two quick questions. > > > > Question 1: > > > > When tomcat creates a TCP connection to a remote server (for example, a > > back-end database) tomcat is acting as the TCP client in that case. Does > it use > > the IP it is listening on as the source IP for its outbound client > connection? > > > > For example, Server1 has three IPs: 10.0.0.1 (primary), and two > additional > > IPs, 10.0.0.2 and 10.0.0.3. Tomcat is listening on 10.0.0.2. It receives > a request > > that requires it to connect to a database server. When it creates a TCP > > connection the database server, which IP does it use as the source > address? > > > > Question 2: > > > > Suppose you have two instances of tomcat on the same server. TomcatA is > > listening on 10.0.0.2 and TomcatB on 10.0.0.3. First, TomcatA > establishes a > > connection to a remote server from its source IP 10.0.0.2, source port > 3456. > > Can TomcatB, which is listening on a different IP, also establish a > connection > > to the remote database server using the same source port 3456, given that > > the sockets is unique (different source IP)? > > > > -Eric > > > > > > > > > > > > > > Disclaimer : This email and any files transmitted with it are > confidential and > > intended solely for intended recipients. If you are not the named > addressee > > you should not disseminate, distribute, copy or alter this email. Any > views or > > opinions presented in this email are solely those of the author and > might not > > represent those of Physician Select Management. Warning: Although > > Physician Select Management has taken reasonable precautions to ensure > > no viruses are present in this email, the company cannot accept > responsibility > > for any loss or damage arising from the use of this email or attachments. > Disclaimer : This email and any files transmitted with it are confidential > and intended solely for intended recipients. If you are not the named > addressee you should not disseminate, distribute, copy or alter this email. > Any views or opinions presented in this email are solely those of the > author and might not represent those of Physician Select Management. > Warning: Although Physician Select Management has taken reasonable > precautions to ensure no viruses are present in this email, the company > cannot accept responsibility for any loss or damage arising from the use of > this email or attachments. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
