Re: [lwip-users] DNS using Wired interface and PPP
On 11.08.2019 20:48, goldsi...@gmx.de wrote: Am 11.08.2019 um 14:55 schrieb Sergey A. Borshch: Hello everybody. My system has two network interfaces: main is wired Ethernet and backup is cellular modem using PPPoS. I want to choose which interface to use by netifapi_netif_set_default(). The problem I expect that both interfaces got DNS servers addresses from providers. It is possible that each of interface is connected to each own subnetwork and each provider has it's own DNS servers in their subnetworks not accessible from outside of subnetwork. It means that when I use wired Ethernet interface I should use DNS servers supplied by Internet provider via DHCP and using cellular modem interface I should use DNS severs supplied by cellular operator via IPCP. What is correct way to do do such scenario in lwIP? As far as I understood lwIP architecture, it uses two global (system-wide) DNS addresses (by default) and each interface overwrites them after getting new values by DHCP/IPCP. So used DNS addresses depends on which interface got their DNS addresses last. Well, I think you're right there. However, is this different on Linux or some other OS? I don't know if there's any standard way of solving this. I don't know how it is implemented internally, but I see DNS addresses fields in every interface settings GUI in Linux Mint and Windows 7. Possibly lwIP also should have DNS addresses in netif structure and access them via netif_default in dns_send() and dns_backupserver_available()? This could be solved e.g. by adding an optional layer between dhcp.c and the call to dns_setserver() so that an application can override this, but I wouldn't want to solve this in a much different way than other stacks... Regards, Simon -- Regards, Sergey A. Borshchmailto: sb...@sourceforge.net SB ELDI ltd. Riga, Latvia ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
Re: [lwip-users] `MEMP_NUM_PPP_PCB' undeclared here (not in a function)
Hi, first: why did you send this three times? Am 11.08.2019 um 09:15 schrieb markus.for...@gmx.ch: Hello I updated lwip from 2.0.3 to 2.1.2 and get the following build error without any modifications: memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) memp_std.h(102): size of array `memp_memory_SYS_TIMEOUT_base' has non-integer type memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) memp_std.h(102): initializer element is not constant memp_std.h(102): (near initialization for `memp_SYS_TIMEOUT.num') Thank you very much for some hints. Seems like MEMP_NUM_SYS_TIMEOUT references MEMP_NUM_PPP_PCB. However, as this doesn't happen in our sources, it's got to be something in your project or header files. Try searching for the definition of MEMP_NUM_SYS_TIMEOUT and see where MEMP_NUM_PPP_PCB is referenced. Regards, Simon ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
Re: [lwip-users] DNS using Wired interface and PPP
Am 11.08.2019 um 14:55 schrieb Sergey A. Borshch: Hello everybody. My system has two network interfaces: main is wired Ethernet and backup is cellular modem using PPPoS. I want to choose which interface to use by netifapi_netif_set_default(). The problem I expect that both interfaces got DNS servers addresses from providers. It is possible that each of interface is connected to each own subnetwork and each provider has it's own DNS servers in their subnetworks not accessible from outside of subnetwork. It means that when I use wired Ethernet interface I should use DNS servers supplied by Internet provider via DHCP and using cellular modem interface I should use DNS severs supplied by cellular operator via IPCP. What is correct way to do do such scenario in lwIP? As far as I understood lwIP architecture, it uses two global (system-wide) DNS addresses (by default) and each interface overwrites them after getting new values by DHCP/IPCP. So used DNS addresses depends on which interface got their DNS addresses last. Well, I think you're right there. However, is this different on Linux or some other OS? I don't know if there's any standard way of solving this. This could be solved e.g. by adding an optional layer between dhcp.c and the call to dns_setserver() so that an application can override this, but I wouldn't want to solve this in a much different way than other stacks... Regards, Simon ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
[lwip-users] DNS using Wired interface and PPP
Hello everybody. My system has two network interfaces: main is wired Ethernet and backup is cellular modem using PPPoS. I want to choose which interface to use by netifapi_netif_set_default(). The problem I expect that both interfaces got DNS servers addresses from providers. It is possible that each of interface is connected to each own subnetwork and each provider has it's own DNS servers in their subnetworks not accessible from outside of subnetwork. It means that when I use wired Ethernet interface I should use DNS servers supplied by Internet provider via DHCP and using cellular modem interface I should use DNS severs supplied by cellular operator via IPCP. What is correct way to do do such scenario in lwIP? As far as I understood lwIP architecture, it uses two global (system-wide) DNS addresses (by default) and each interface overwrites them after getting new values by DHCP/IPCP. So used DNS addresses depends on which interface got their DNS addresses last. -- Regards, Sergey A. Borshchmailto: sb...@sourceforge.net SB ELDI ltd. Riga, Latvia ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
[lwip-users] `MEMP_NUM_PPP_PCB' undeclared here (not in a function)
Hello I updated lwip from 2.0.3 to 2.1.2 and get the following build error without any modifications: /lwip/src/core/memp.c(79): /lwip/src/include/lwip/priv/memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) /lwip/src/include/lwip/priv/memp_std.h(102): size of array `memp_memory_SYS_TIMEOUT_base' has non-integer type /lwip/src/include/lwip/priv/memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) /lwip/src/include/lwip/priv/memp_std.h(102): initializer element is not constant /lwip/src/include/lwip/priv/memp_std.h(102): (near initialization for `memp_SYS_TIMEOUT.num') Thank you very much for some hints. Best regards Markus ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
[lwip-users] `MEMP_NUM_PPP_PCB' undeclared here (not in a function)
Hello I updated lwip from 2.0.3 to 2.1.2 and get the following build error without any modifications: /lwip/src/core/memp.c(79): /lwip/src/include/lwip/priv/memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) /lwip/src/include/lwip/priv/memp_std.h(102): size of array `memp_memory_SYS_TIMEOUT_base' has non-integer type /lwip/src/include/lwip/priv/memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) /lwip/src/include/lwip/priv/memp_std.h(102): initializer element is not constant /lwip/src/include/lwip/priv/memp_std.h(102): (near initialization for `memp_SYS_TIMEOUT.num') Thank you very much for some hints. Best regards Markus ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
[lwip-users] `MEMP_NUM_PPP_PCB' undeclared here (not in a function)
Hello I updated lwip from 2.0.3 to 2.1.2 and get the following build error without any modifications: memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) memp_std.h(102): size of array `memp_memory_SYS_TIMEOUT_base' has non-integer type memp_std.h(102): `MEMP_NUM_PPP_PCB' undeclared here (not in a function) memp_std.h(102): initializer element is not constant memp_std.h(102): (near initialization for `memp_SYS_TIMEOUT.num') Thank you very much for some hints. Best regards Markus ___ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
