SW
2004-Jan-12 14:41 UTC
[Asterisk-Users] FW: How to bind RTP when IP alias are configured
> Hi Folks, > > I have a situation where my Colo insists on a particular IP setup > for my * server box. They allocate two blocks of IPs to my colo > server. One set as my own (ex 20.20.20.20.4/30 - 4 ips) and the > other as a transit lan (es 10.10.10.0/29). These are all public > IP addresses and there is no NAT involved in. > > So essentially I have to set-up IP aliases in my Linux box as follows; > > Example: > > TRANSIT LAN: 10.10.10.0/29 > CUSTOMER LAN: 20.20.20.20.4/30 > > RedHat LINUX > > FILE: /etc/sysconfig/network-scripts/ifcfg-eth0 > > DEVICE=eth0 > IPADDR=20.20.20.20.4 > NETMASK=255.255.255.255 > ONBOOT=yes > > FILE: /etc/sysconfig/network-scripts/ifcfg-eth0:99 > > #################################### > ## TRANSIT IP: DO NOT UNCONFIGURE ## > #################################### > DEVICE=eth0:99 > IPADDR=10.10.10.4 > NETMASK=255.255.255.248 > NETWORK=10.10.10.0 > BROADCAST=10.10.10.3 > GATEWAY=10.10.10.1 > ONBOOT=0 > > ---------------------------- > First of all. I can ping to customer lan and telnet to it, > therefore IP routing (at least for unicast traffic) works fine. > > Now question arises when asterisk start to work on this box. > Since the IP that I am supposed to use is 20.20.20.4, I set that > as bindaddress in my sip.conf file. As far as SIP messages are > concern * users that IP address, no problem. However for RTP > stream * users 10.10.10.4 as it's source address. Because of this > obviously calls will not go through asterisk, as the ip phone is > expecting RTP packets from the SIP server which is bound to IP 20.20.20.4. > > Is there a way to tell * to use the same bind address in SIP.conf > (h323.conf, iax.conf) for RTP ????? > > I read rtp.conf file but that does not show any bind address. > > It seems like LINUX always select it's src address as the > interface (alias) which has the gateway tied to it unless > otherwise an application specifically asks Linux to use a > particular ip address. > > Cheers > > SW > > > > > >